The boiling runoff churned against the elevated platform.
Thick steam rose from the flooded tracks and turned the lower tunnel into a white, cooking fog.
Caleb dragged his heavy boots over the ledge and rolled onto cracked tile.
He stayed on his back long enough to pull hot, ozone-laced air into his lungs.
Waterlogged canvas anchored his legs. His shoulder sat wrong, torn deep enough for the thing under his ribs to notice.
Iharu knelt near the stairs with his scatter-gun leveled at the steam.
Kikaru sat against a shattered advertising board. A jagged scorch scar marked her white armor. She pressed one trembling hand to her ribs and breathed through clenched teeth.
Hiro had locked up by the handrail, eyes fixed on the fog. Caleb knew that expression: lag, not cowardice.
His mind was catching up to the fact that its own voice had become bait. Disposal-yard crews got the same look when a dead machine started moving under a tarp.
Gunfire had died.
Only the soft boil of runoff remained.
Then a voice echoed from the far end of the platform.
"Help me. Please."
Hiro's voice drained the color from his face.
The sound came again, cracked and terrified. "I dropped my rifle. I cannot get up."
The Mimic had left the water.
It had climbed further down the platform while its own heat made cover for it. It was learning the tunnel. Learning their voices. Testing which sound made them hesitate.
That made the fight smaller and worse.
A horde could be managed with formation.
A big monster could be managed with artillery, if somebody had enough time and enough money.
Something that watched, copied, and adapted inside a broken tunnel with four wounded recruits was a different kind of problem.
Caleb forced himself to his knees.
Pain tore through the stabilizing muscles around his collarbone. The biological anomaly under his sternum reacted instantly.
Hunger opened in his gut. Hard. Hollow. Acid climbed the back of his throat.
The anomaly wanted calories to repair tissue, and there were none.
He drew the combat knife from his belt. His rifle was gone in the flooded tracks.
"Where is it?" Iharu whispered. The pump of his scatter-gun clacked too loudly.
"Do not shoot wild," Kikaru ordered.
She tried to stand and winced against the brace under her armor.
"Kinetic slugs will ricochet off support pillars. We hold position until surface divisions secure the breach."
Caleb checked the crater overhead.
Smoke and asphalt dust still rained from above.
"Surface thinks the zone is secure," he said. His voice came out rough. "We are on our own."
He checked his visor. Public feed still green. Forty thousand viewers. Sixty-five. Eighty.
Chat flooded so fast it became white noise.
User99: What is that thing?
TitanSlayer: Surface feed missed this!
RedLine: Scrubber saved Mitsurugi again.
GunnerFan: 80k on a Rank F stream.
Eighty thousand people watching.
Eighty thousand chances at credits.
The debt penalty hung behind every breath. His mother's housing sector. His brother's life-support augments. The whole cruel ledger waiting for him to fail.
That number also meant eighty thousand witnesses.
If he died, at least the payout might still process.
The thought was horrible.
It was also the first practical comfort the day had offered.
Caleb stood.
He moved past Iharu to the front.
Hiro reached for him and stopped halfway.
The younger recruit had no useful words. His copied voice still echoed in the back of everyone's skull. Caleb saw shame start to form on his face and cut it off with a look.
There was no time for shame.
Shame was for rooms with chairs.
"What are you doing?" Iharu whispered. "You have a knife."
"Keeping it busy."
"That is not a plan."
"It is a job."
"Caleb," the voice whispered from the left, with wet clicking threaded beneath the stolen word.
The sound bounced off tile and pillar, hiding its origin.
A heavy shadow detached from the dark.
The Mimic stood over twenty feet tall. Its segmented obsidian carapace glowed with internal heat. Thermal radiation baked the damp air and dried sweat on Caleb's face.
Its ruined leg from Kade's strike had already adjusted instead of healed.
The creature shifted weight through secondary limbs and moved around damage like it had been born expecting parts of itself to fail. The lesson settled cold in Caleb's stomach.
Hurting it would never be enough. He had to make the environment bigger than its ability to adapt.
It charged. Claws tore gouges through tile. A bladed limb swept for Caleb's neck. He dropped his weight. The blade sheared above his helmet.
The suit fibers whined, pushing that miserable one-point-two percent into his legs. Caleb drove upward, guided by the same disposal-yard knowledge that had kept saws from killing him.
The old rule narrowed the whole monster to one target: joint.
The knife plunged behind the armored knee into a pale membrane.
His wrist twisted.
Scalding black fluid erupted and burned across his gloves.
The Mimic screamed like tearing steel.
It thrashed into a support pillar. The ceiling groaned and dumped gray dust over the platform.
Kikaru saw the crack first.
Her attention cut from the pillar to the floor seam spreading beneath Caleb's boots. She saved the breath she might have wasted on his name.
"Left," she barked.
Caleb threw himself left as a chunk of tile dropped away behind him.
Caleb ripped the knife free and scrambled back ten yards, enough to breathe and nowhere near enough to be safe.
The biological cost hit him. Black spots danced in his vision. His legs had filled with lead.
Another minute and he would collapse.
The Mimic regained balance, dragging its ruptured leg. Steam poured from the wound. Acidic blood melted tile.
Its attention returned to Caleb.
"Secure perimeter," it said in Kade's voice, and lunged.
Caleb backed toward the platform edge.
The floor beneath his boots was cracked from the earlier impact. The support column to his right had a fracture running through the base.
Another joint was beyond him, so the station would have to hit harder than he could.
"Iharu!" Caleb shouted, pointing. "Pillar!"
Iharu swung the scatter-gun. "You said never shoot pillars!"
"Shoot the damaged one!" Kikaru snapped, and that was enough to move him.
Iharu's fear turned into offense, and offense was useful. He planted his boots, leaned into the recoil, and aimed at the fracture Kikaru marked with two fingers.
Hiro finally moved too. The feeds would never reward it as bravery, but he dropped to one knee, grabbed Caleb's fallen knife before it slid into the water, and kicked it back across the tile toward him.
Useful counted.
The blast slammed through the platform.
Kinetic slugs pulverized the cracked support.
The Mimic stepped onto the compromised section just as the column failed.
Concrete gave way.
The ledge collapsed under its weight.
The creature shrieked and dropped into the boiling water below. Slabs of concrete and twisted rebar rained after it, burying the glowing carapace under tons of debris.
Steam exploded upward. Hot rain lashed the platform. Caleb stumbled away from the edge. His knife slipped from his hand. His knees hit tile. He vomited bitter acid onto the floor. His muscles trembled.
He wiped his mouth with the back of his glove and checked the visor.
One hundred and fifteen thousand viewers. Caleb closed his eyes. For one month, the debt was covered. Maybe. If the Guild paid clean. If taxes spared the spike.
If the private ghost kept her hand away from the money before it reached his family.
Caleb had learned young that hope needed conditions attached.