The cuff swung toward Ty’s hand as if the room had been waiting for the blood.
He stepped back and nearly bumped the case. The far rail dragged the glass forward another inch, then stopped with the cuff hanging between Ty and the pressure station. The leather inside the metal ring looked cracked from age, but the hinge still moved cleanly.
JJ put her sword between Ty’s wrist and the cuff.
"The building can ask like a person before it grabs him," JJ said. "I am very tired of polite signs with rude hands."
Blue moved beside the station and studied the tubes. The old red rings inside the glass had dried at different heights. Some were thin as thread. Others sat wide enough to make Ty think of fingers pressed against a wound too late.
The cuff twitched against JJ’s blade, and the rail below the case answered with a slow metal knock.
Ty kept his bleeding hand closed. Blood pushed between his fingers anyway, warm in the lines of his palm. The mark pulsed through the cut skin and pulled toward the cuff like it knew the shape.
"It wants the marked hand because the fan room opened the skin," Ty said. "The pressure in the rail feels stronger when I bleed."
"That sentence earns several objections from every living adult nearby," JJ said. "Blue, find the version where he keeps the hand."
Blue wiped dust from the glass tubes with her sleeve. Each tube fed into a square block of brass with three small valves. One valve had a chipped white handle. One had been replaced by a nail through a washer. The third had a round cap sealed with old wax.
"This is a pulse lock, not a drain line," Blue said. "It should read pressure changes from a living worker before the load enters the cold section."
"Should has returned wearing a false mustache and stolen boots," JJ said. "Explain the dangerous part first before it bites him."
Blue tapped the widest glass tube with Marcus’s bit.
"The dangerous part is that the return line is stuck," Blue said. "If the cuff squeezes and the return stays closed, pressure builds in his hand until something gives."
Ty looked at his palm. Blood had reached his wrist.
The old body inside the case shifted. The hand nearest Ty rested against its strap, loose bones held in place by old fabric and glass. The rail wanted the sealed body forward. The room wanted proof a living escort could survive the next section.
Those two wants had started using Ty as the place where they argued.
"Can we fake the pulse with the case springs?" Ty asked. "The room cares about pressure, so maybe we give it pressure."
Blue slid Marcus’s bit into the capped valve and tested it. The wax cracked, but the cap held.
"Case springs give load pressure, not living pressure," Blue said. "The lock separates freight from people for a reason."
"The reason aged badly and started biting at everyone nearby," JJ said. "I would like to file that under hostile architecture."
Ty flexed his hand again. The mark throbbed hard enough to make his knuckles tighten. He could feel the cuff through the air now, or through the rail, or through whatever route the old worker metal had made under his skin.
The case moved another inch toward the station.
The cuff followed the case with mechanical patience.
JJ’s sword scraped along the metal ring. The blade held, but the cuff pushed with steady patience. It had all day. Ty had a bleeding hand and a corridor behind him full of fans.
"If I use the cuff, you keep the return open," Ty said. "The second it pulls more than pulse, you cut the line."
"I prefer plans where cutting comes before bleeding," JJ said. "This plan has chosen a poor order for my comfort."
"The room already has the blood on my palm," Ty said. "We decide how much pressure it gets from there."
Blue looked at him, then at JJ. Her face had gone work-flat, the way it did when fear became math and hand placement.
"I can open the return if JJ holds the cuff hinge," Blue said. "Ty keeps his elbow high and his fingers loose. If he clenches, the cuff reads struggle and squeezes harder."
"My fingers dislike receiving moral instruction from a pipe," Ty said. "I will try to be persuasive with my hand open."
JJ moved the sword to the hinge and wedged the flat near the locking tooth. Blue set Marcus’s bit into the nail-and-washer valve. Ty held his marked hand out.
The cuff snapped around his wrist and locked before Ty could blink.
Pain ran from palm to shoulder. He bit down until his jaw hurt. The cuff tightened, paused, and tightened again around the beat of his pulse. A thin red line climbed the first glass tube.
Blue turned the return valve, and nothing moved.
"Return is stuck at the first thread and fighting the bit," Blue said. "I can force it, but the washer may shear."
"Force it before his hand becomes a lesson," JJ said. "I am done learning from this building for free."
Ty kept his fingers loose. That took more effort than pulling the case had. His hand wanted to close, wanted to protect the split mark, wanted to become a fist against the metal mouth around his wrist.
He opened his fingers wider as the cuff squeezed again.
The red line jumped in the glass fast enough to scare Blue.
The rail under the case woke with a grinding turn. The pressure station accepted the pulse and fed it forward through the wall tubes. The case rolled six inches, then stopped as the red line stalled under the stuck return.
Ty felt the stall inside his palm, the mark pushed back, and the cuff squeezed harder.
"Return now before the cuff teaches my hand pressure," Ty said through his teeth. "It is pulling against the mark rather than the rail."
Blue braced one foot on the station and put both hands on Marcus’s bit. The nail valve bent. The washer screamed against the brass. JJ shoved her sword deeper into the cuff hinge and kept the locking tooth from biting down another notch.
"The valve is moving, but the room hates maintenance," Blue said. "I need three more turns and a better childhood."
"You can borrow my terrible one for leverage," JJ said. "It has produced excellent spite under worse conditions."
Blue laughed once, hard and breathless, then twisted.
The washer sheared, and the return valve opened too far.
Blood in the tube dropped all at once.
The cuff released pressure and then grabbed again, confused by the fall. Ty’s fingers jerked. The mark burned through the cut in his palm. He saw the red line in the tube bounce, rise, fall, rise.
The lock began to count the wrong thing.
The case shuddered on the rail. The old body inside pulled against its straps, skull lifting by a fraction from the support cradle. The pressure station tried to match Ty’s living pulse to the sealed load.
"It is pairing me with the case through the cuff," Ty said. "The room thinks my pulse belongs to the load now."
JJ’s jaw tightened. She kept the sword in the hinge with both hands.
"That sounds like ownership wearing a worker coat," JJ said. "Tell me where to put steel so it loses interest."
Blue followed the tube with her eyes. The return line dropped into the floor, but a thinner bypass tube ran along the wall toward the case rail. The bypass had a pinch clamp shaped like a small jaw, rusted open.
"There is a bypass linking cuff pressure to freight pressure," Blue said. "It probably saved injured workers by letting the load carry the spike."
"Today it is stealing from the injured worker to move the load," Ty said. "That is a less generous interpretation of worker safety."
"The generous version died before we arrived in this room," JJ said. "Blue, can you close the little jaw before he pays for it?"
Blue ran to the bypass and jammed Marcus’s bit into the clamp screw. The screw turned half a thread and stuck. The bypass tube kept beating red in time with Ty’s hand.
Ty looked down at the cuff. The leather had soaked through under his wrist. His fingers had gone pale at the tips. He lifted his elbow the way Blue told him, and the tube jumped again.
The case moved another foot, and the old skull turned toward him.
Ty hated that part most. The old body was sealed, wordless, and still pulling meaning out of every bad machine around it. People had used it as proof, freight, claimant, burden, and answer. Now a broken worker lock tried to make his blood carry it.
He leaned toward the case until his cuffed wrist shook.
"You are not taking pulse from me to move him," Ty said. "Take the pressure from the rail and leave the hand as the key."
The words mattered less than his hand on the frame.
He pressed his free palm to the case rail. The mark in his cuffed hand beat against the metal ring. His other palm found the rail pulse beneath the glass. Two pressures. One living. One load.
He separated them by feel, assigning his hand to the key and the rail to the weight.
The cuff tried to drag both together again.
Ty shoved the rail pressure away from his pulse and into the case frame. His shoulder locked. His wrist burned. The red tube snapped down, then steadied in a thin line rather than a jumping one.
"The bypass just weakened under your hand right now," Blue said. "Whatever you are doing, keep doing it while I ruin this screw."
"I am arguing with plumbing through blood with one bleeding palm," Ty said. "That sentence is staying out of any official report."
"Every report about us has surrendered already after today," JJ said. "Hold the argument and keep breathing until Blue closes it."
Blue struck Marcus’s bit with the heel of her hand. The screw moved. She struck it again. The pinch clamp crept down over the bypass tube, little by little, until the red beat inside the glass thinned to a thread.
The cuff stopped matching the case, and Ty’s hand throbbed on its own again.
The pressure station changed sound. Gears behind the wall turned in a calmer rhythm. The case rolled forward on the rail with less drag. The cuff stayed closed, but the squeeze settled into the beat of Ty’s pulse rather than fighting it.
"The cuff is reading key only now from the mark," Blue said. "It still needs enough pressure to open the cold lock."
"How much is enough before he loses hand function?" JJ asked. "I want numbers or a scream-based estimate."
Blue watched the glass tube rise and fall.
"Two more pulses at this height should trip the far door," Blue said. "Three means I cut the cuff because I like him attached."
Ty looked at the far door. Frost had gathered around its edges where the pressure lines entered the frame. The metal there was cleaner, newer, or rubbed smooth by years of cold air leaking through.
The first pulse lifted the red line, and the far door’s lower lock clicked.
Ty breathed through his nose and kept his fingers open.
The second pulse rose higher, and the upper lock clicked.
The cuff tightened for a third before JJ moved.
JJ drove her sword into the hinge before Ty could tell her to wait. Blue slapped the release cap with Marcus’s bit at the same time. The cuff sprang open and threw Ty’s hand free.
He stumbled back against the case. Blood ran down his fingers and dripped onto the rail. JJ caught his forearm above the wrist and held it high without closing around the wound.
"Two was enough, and three was greedy for any sane lock," JJ said. "The room can complain to someone with worse priorities."
Blue wrapped Ty’s palm with a torn strip from her sleeve. She pulled the cloth tight enough to make him inhale through his teeth, then tied it off with quick, angry knots.
"Keep this hand above your heart for a little while," Blue said. "If the mark argues, remind it the rest of you votes too."
"The rest of me votes for leaving this room," Ty said. "The hand may abstain under protest until we leave."
The pressure lock opened with a tired metal release.
Cold air rolled out low across the floor and curled around their boots. The red in the wall tubes drained back into the station, leaving the glass streaked and dull. The case rolled through the opened frame, slower now, as if the rail had learned to be careful with the living pieces walking beside it.
Ty followed with his wrapped hand held high.
Beyond the door, the corridor widened into a white storage hall built from stacked ice blocks and curved shelters. Small domes lined both sides of the rail like a village for workers who had expected cold shifts and long waiting hours. Lantern hooks hung empty beside each shelter door.
The air tasted clean enough to hurt after the pressure room.
The worker sign above the opened door read Igloo Nation.
Inside the first ice shelter, something scratched once against the wall.