The crew had two spears, six tools, thirty metres of cargo cable, and no good plan.
They also had less than an hour of reliable filter time, one mobile frame, one person who required the litter, two others whose injuries could worsen without warning, and an Elite learning the pocket's shape through sound.
Klara ordered a planning clock of eight minutes. At its end they would either have a bounded action or reassess the hot vent route without the frame. The Matriarch would not wait because humans needed a satisfying plan.
Elias emptied the extraction-frame cases onto basalt.
He arranged equipment by function, not by how weapon-like it appeared. Fixing. Pulling. Blocking. Seeing. Medical. Ammunition remained with Tobi.
Ironmoss resin cartridges. Treated specimen tarp. Four pitons. Survey lamp. Folding rails. Manual clamps. Compact winch rated for two tonnes under straight load. Tobi’s remaining ammunition: three standard, one sonic charge, one mana-treated penetrator.
The resin had contained Ash-Mites and repaired harnesses. Heat accelerated its cure but weakened the ordinary mix, which was why Georg carried dry ironmoss powder for field patches. The specimen tarp had protected pharmaceutical bladders from light and contamination; its weave resisted heat, tearing, and mana-reactive fluid. Pitons anchored frames in existing cracks without drilling. Rails bridged shard falls and levered cargo. Cable moved loads no harvester could lift.
None had been designed to kill. All had documented limits.
Elias's utility spear remained collapsed beside the medical rail. Opening it would give him reach and one weak repulsion pulse. It could not penetrate the Matriarch's plates, and carrying it with the survey lamp would slow the retreat. Klara kept it as emergency defence at the pocket instead of making it part of the primary sequence.
Her own spear was the only reusable tool with a channel long enough to reach beneath opened armour. She had one thrust available. That made it a finishing condition, not a weapon for creating the opening.
Three standard rounds remained after the diversion contact and failed-model test. The count removed any plan requiring suppressive fire.
“We cannot armour through her,” Farid said.
The fixed shield at the pocket mouth already showed a new crease from holding back her follow-through. Farid could operate expansion with his right hand if the frame took the lower load. He could not reposition it under impact.
His broken left arm was fixed against his chest. He sat beside the frame with the shield controls moved to his right hand.
“We don’t,” Elias replied.
“Cannot outrun.”
“No.”
“Cannot outshoot.”
Tobi touched the expensive round at his belt. “One penetrator may enter a joint. It will not kill through core armour.”
The round cost more than the frame. Its mana-treated jacket could preserve force through dense plate for one short channel. Fired at the crown or chest, it would produce an expensive shallow wound. Fired into an opened joint under load, it might alter mechanics.
Tobi had concussion restrictions and one usable firing position. A plan that required him to improvise a moving shot was not a plan available to this crew.
Georg picked up a resin cartridge. “What do we make her do?”
The question belonged to harvest work. Silverleaf could not be forced to grow differently, but the tool angle, tension, and approach could be controlled. Resource crews changed conditions until the material yielded without destroying what they needed.
At Sillglass, they had not made the route true. They had tested which evidence survived. With Ash-Mites, they had not overpowered the swarm. They had narrowed its movement until heat cured the trap. At the relay sink, they had abandoned equipment when geometry made retrieval unsafe.
The Matriarch was not a plant or a swarm. She could observe and adapt. Any condition they created had to become decisive before she could sample it twice.
Elias reviewed the Matriarch’s passes.
He used helmet frames, not Analysis memory alone. Slow approach before the sonic test. Four-beat charge into Farid. Adaptive feint into Klara. Withdrawal to brood. Four samples, two under full load.
During the strike against Farid, she loaded the left foreleg slightly later. During the feint against Klara, the left shortened before the turn. A pale line crossed the joint armour beneath old scar tissue.
During ordinary walking, the middle legs hid the difference. During acceleration, the right foreleg accepted first force and the left followed. During the lead change, the Matriarch reduced left reach before shifting through the middle pair. The pale line did not glow, pulse, or acquire a System label. It was healed tissue moving under more mass than its original shape had been built to carry.
Not a secret weakness. An old injury under enormous weight.
One bullet would not make the limb disappear. A cable would not overpower the animal. The leg mattered only if the crew combined penetration, load direction, restricted movement, and the Matriarch's own momentum in the same instant.
Observed load asymmetry: left foreleg. Compensatory shortening before turn. Confidence: 74%
“Left foreleg,” Elias said. “Old damage. She protects it by changing lead.”
“Correction,” Klara said. “We observed shortening before one change. Protection is inference.”
“Old damage. Shortens left before adaptive turn. If she cannot change lead, full load may expose the scar.”
“Better.”
“Until?” Klara asked.
She lay against the wall with her thigh dressed and one spear across her lap. Nika monitored the bandage while conserving the last of her mana.
“Until she has no lateral room.”
Elias marked the approach width. Four point two metres at the brood threshold, widening to six near the pocket. The Matriarch needed approximately one point four metres to shift the crown and middle legs across the lead. Removing the side cut could reduce available space below that—if the barrier held long enough and if she entered centred.
The side cut beside the brood approach was four metres wide. Wide enough for the Matriarch to shift.
The specimen tarp could remove half of it if fixed between wall and basalt spur.
Not by resisting the animal's full mass. The tarp would present a visual and tactile boundary at shoulder height, backed by rail and piton. A Stoneback could tear through it. Doing so during a charge would require lateral movement and time. The plan needed only the first straight line.
Georg tested resin against the hot stone. The first bead softened. He mixed ironmoss powder into the second cartridge and pressed it beneath a piton plate. The compound cured black and rigid.
He waited thirty seconds, struck the plate with the frame rail, and measured the resin edge. Hairline cracking, no lift. A second strike broke it.
“One dynamic load under this heat,” he said. “Maybe less if the basalt moves.”
They tested the tarp weave beside the ward line. Nika applied a thread of mana no stronger than her planned shoulder push. The treated fabric shed it without igniting. The result did not prove what a keystone-infused Elite would do.
“Holds for one impact,” he said.
“One is the plan,” Tobi replied.
“One is the assumption,” Klara said. “Plan includes what happens if it is zero.”
If the tarp tore before commitment, Elias withdrew without crossing the cable. Nika did not cast. Tobi did not fire. Georg released the winch line so nobody became attached to a failed barrier. They returned to the pocket and lost the materials, not the team.
Elias laid cargo cable across the approach. The winch could not stop the Matriarch. It did not need to. If the cable tightened around the damaged leg at the instant full weight transferred, momentum would complete the pull.
Cable placement mattered more than strength. Too low and the foot stepped over. Too high and the loop slid along armour. Too early and the Matriarch saw it before charge. They ran the line through two shallow basalt grooves, dusted it dark, and left a loop that would rise only when Georg took tension.
The winch's two-tonne rating applied to straight load through approved anchors. The Matriarch's momentum could exceed it. Georg angled the machine so overload would shear the sacrificial clamp before pulling the frame into the crew.
“If the clamp breaks, cable goes chamber-side,” he said. “Farid controls loose tail. Nobody catches it.”
“How do we make her choose left?” Georg asked.
“We don’t. Nika forces load from right after commitment.”
Nika had enough mana for one narrow shape lasting less than a second. She could not choose which foot the Matriarch placed. She could apply lateral force to the right shoulder after rear weight left the ground, making the right side rotate inward and transferring corrective load left.
Cast too early, and the animal adapted. Too late, and the shoulder crossed before force coupled. Elias would call commitment; Nika would decide whether her own sensory evidence agreed.
Nika looked at the approach. “Directional ward on the right shoulder. I can turn it, not hold it.”
“That puts weight left before she can switch.”
“If she commits straight.”
“And if I can form cleanly,” Nika said. “My hands are stable. Mana recovery is not. I get one attempt, perhaps none if Klara's pressure fails.”
Medical need still outranked the plan. They placed an ordinary mechanical backup on Klara's dressing so Nika could leave the monitor for seconds without pretending the injury stopped existing.
The brood entrance solved that.
Or appeared to. The Matriarch's repeated orientation made brood defence the most supported behavioural constraint. Crossing the threshold with light on an egg should provoke direct removal. It might also trigger a site effect they had never seen.
Elias proposed the minimum intrusion: one step across the outer shell line, survey lamp on maximum, no contact with the eggs. If the animal did not commit before he reached the marked retreat instant, he withdrew. He would not go deeper to make the model true.
Every time they withdrew from its line, the Matriarch stopped pursuing. She would not turn her unarmoured inner flank toward the chamber. A threat at the threshold should force a direct protective charge.
“Bait?” Klara asked.
Elias took the survey lamp.
The lamp had guided sample grades, exposed Sillglass reflections, and marked routes. On maximum it produced enough broad white light to irritate Stoneback sensory plates without the acoustic cost of gunfire. Elias could hold it away from his body and leave both hands available after release.
“Me.”
Farid said, “No.”
“I know the call timing.”
“Klara can—”
“Klara cannot run.”
The words landed too hard. Elias met her eyes.
“I caused that.”
The statement entered the space where a plan should have been. Klara did not let it purchase risk.
“Do not choose bait as penance,” Klara said.
“Operational reason,” she demanded.
“I am mobile within medical limits. I can identify weight transfer from the front. Armed Resource Support permits the lamp and utility spear under your order, but this task needs no strike. Georg must operate the winch. Tobi must remain fixed. Nika must cast. Farid controls cable. You must retain command and final spear.”
“And if another mobile person could carry the lamp?”
“They could. There isn't one without removing a required role.”
Klara looked to each of them. Nobody contradicted the allocation.
“I’m choosing it because the lamp has to mark the line, Analysis needs the front angle, and I can withdraw through the tarp gap.”
“Can you make the distance?”
Elias measured. Brood threshold to winch line. Winch line to side gap. His Level Seven Agility and months of training. No mana reinforcement.
“If I move before full commitment, she adapts. If I move after, I have four beats.”
The retreat path measured nine metres from threshold to tarp gap. Elias's best rested sprint covered it. He was not rested, and the floor contained cable. They cleared loose stone and marked three strides with lamp tape. Nika checked his knee: pain zero before load, stability reduced by fatigue but inside emergency movement range.
“If pain changes before execution, you disclose,” she said.
“Yes.”
“If it changes during?”
“I finish the retreat if able, then report. If unable, I call down and the plan aborts around me.”
Nobody said the Matriarch would respect a medical stop.
“That was your old model.”
“The beats can change. The shoulder load cannot disappear after Nika’s ward. I call from weight, not cadence.”
They tested the call using helmet footage at half speed, then normal. Elias stopped saying numbers. He called rear lift only when both front legs received committed mass and the middle pair gathered beneath the body. Nika used that physical state, not his word alone.
Klara made him state the failure conditions.
If the tarp did not hold, abort to pocket.
If the Matriarch refused the threshold, do not advance farther.
If Nika missed the shoulder, Tobi withheld the round.
If the cable failed to seat, Georg did not trigger.
If Elias could not see load, he made no call.
Additional failures came from the injuries. If Klara's pressure alarm crossed red, Nika stayed medical and the plan did not begin. If Tobi's vision doubled or his supported sight failed, the penetrator remained sealed. If Farid lost balance controlling cable, Georg released load. If the Matriarch breached the fixed pocket shield before they completed rigging, everyone took the hot vent route on foot and left the frame.
“No confidence number substitutes for observation,” Klara said.
“Understood.”
They built the plan.
Klara recorded it on local helmets because the fibre was dead. She named the objective: create one straight protective charge, mechanically fail the damaged left foreleg, and open an armoured channel for her finishing strike. The objective was not to recover the core or protect equipment.
Uncertainties followed. Brood response. Tarp duration. Ward timing. Penetrator effect. Cable seating. Joint load. Klara's ability to complete one movement. Each remained spoken rather than dissolving inside the final shape.
Georg and Elias resin-fixed the tarp across the side cut. Pitons entered existing cracks rather than solid basalt. Farid, working one-handed, anchored the winch and cleared loose cable. Tobi selected a firing notch. Nika marked the ward line. Klara tested whether she could rise on the uninjured leg and deliver one thrust.
Georg mixed the last strong resin in two batches so one bad cure would not take every anchor. Elias tensioned the tarp only enough to remove slack; over-tension would peel the first piton before impact. They placed a folding rail behind its lower edge so the Matriarch met a boundary, not loose fabric.
Farid strapped his broken arm tighter, sat behind the winch frame, and routed the cable tail beneath his good forearm. His task was not to hold the machine. It was to keep the slack from crossing Nika or Tobi if the sacrificial clamp failed.
Tobi rested his weapon on a rail cradle. Georg aligned the notch with the point where left joint armour would open under warded load. Tobi performed a dry sight check once and closed his eyes afterward to control nausea.
Nika drew the ward line in chalk, then conserved mana. Klara moved from wall to spear in one controlled rise. Her pressure dressing climbed amber, stabilised, and returned. One thrust remained possible. Not repeatable.
She could.
Once.
They rehearsed without bodies moving through the lane.
Elias called rear lift from the saved footage. Nika raised her empty hand but spent no mana. Tobi tracked the projected joint without dry-firing. Georg took cable slack by one centimetre. Farid trapped the tail. Klara repeated execute, then marked the finishing channel with her spear from the floor.
The first rehearsal exposed a language collision. Elias said left load while Georg expected load left to mean winch direction. They replaced both with joint open for Tobi and left bearing for Georg. Klara alone said execute.
The second exposed timing. Georg could not see the shoulder through the frame. He needed Elias's call and Klara's confirmation. Tobi could see the joint but not the cable loop. He would withhold if the loop failed to rise, even after firing authority.
No one assumed the real sequence would remain as tidy as rehearsal.
The Matriarch struck the floor beyond the corner.
Dust lifted from the pocket mouth. The fixed shield shifted half a centimetre. Heat showed nineteen minutes to the conservative filter reserve Klara had set for completing action and beginning extraction.
Nika checked Klara's pressure one final time. Green. Tobi named one penetrator, one sonic, and three standard. Farid named cable clear. Georg named clamp and anchors set. Elias named knee zero, route clear, Analysis broad.
The tarp shivered from the impact.
Every weapon in their plan had spent most of its life carrying samples, fixing equipment, or protecting material from weather.
Elias lifted the survey lamp.
“Ready,” he said.
Klara asked the question that mattered. “Reason to abort before start?”
Each role answered no. Not safe. Not certain. No current observation had crossed a failure condition.
This time, Klara owned the answer.
She looked once at the cable, tarp, firing notch, ward line, lamp, and people assigned to them. The plan did not promote Elias to command because he had assembled its observations. It translated six bounded roles into one action she remained responsible for ordering.
“Objective is route creation and crew survival,” she said. “Kill only if the opening supports it. Core and brood are not priorities. After contact, Nika owns casualty state.”
“Execute.”
The order did not certify the model. Every stop and failure limit remained active when execution began.