"Kaelen."
Lara's voice came out thin.
Not weak.
Just squeezed.
He did not answer right away.
He was on one knee in the dark, one hand pressed to the floor, the other held out to keep from falling face-first into a bed of broken glass.
The smoke had gotten worse.
It wasn't just hanging in the air anymore.
It was behaving like something with a job.
His read layer was gone.
Just gone.
No clean lines.
No bright labels.
No easy geometry.
For the first time since the Interface had woken up, Kaelen saw nothing useful.
That was almost funny.
Almost.
He blinked hard and got only black.
The smoke ate light before it could become shape.
It ate shape before it could become code.
Even the node pulse in the center of the room had flattened into a dull pressure behind his eyes.
So this was what it felt like to be blind in a system that usually liked to talk too much.
He shifted his weight and felt a shard grind under his palm.
"Great," he muttered.
The word came out dry.
He dragged his hand off the floor and wiped blood and grit onto his coat.
The three shards in his ribs still burned, but the pain had become background noise.
The worse problem was breathing.
Each inhale felt tight.
Not panicked tight.
Mechanical tight.
The node was doing something down here.
He could feel it even without the source layer.
It was pulling.
Not hard yet.
Just enough to make the air feel expensive.
The sound of glass scraping concrete came from somewhere to his right.
Slow.
Deliberate.
The Glassman was still moving.
Kaelen turned toward the sound, shoulders low, legs bent, every sense narrowed to the dark.
The smoke made depth impossible.
A broken piece of floor, a bent pipe, a wall, all of it blended into the same dead color.
He could not read the room.
He had to feel it.
His fingers brushed a cable on the floor.
Thick.
Cold.
Live.
That helped.
He moved one hand along the cable and crouched lower, listening.
Scrape.
Scrape.
Closer.
The guardian had been hurt, but not broken enough.
Good.
Bad.
Both.
Kaelen did not have time to decide which one mattered more.
Then the thing hit him.
Not a full charge.
A crawl.
It came in low, using the smoke and the dark, its glass arms dragging along the floor like transparent scythes.
Kaelen barely caught the shape before one arm swept toward his shin.
He jerked back, too slow by a breath.
The edge kissed his left calf and opened the skin in a thin line.
Pain flashed hot.
He hissed and shifted sideways, one hand hitting the floor to keep from tipping over.
The Glassman's head turned toward the sound.
Kaelen could not see its face, but he felt the attention settle on him like weight.
The guardian moved again.
Another scrape.
Another low sweep.
Kaelen rolled his injured leg under himself and pushed backward with one foot, not elegant, just enough.
The second arm slashed through the space where his knee had been a moment before and smashed into the wall behind him.
Concrete grit fell into his hair.
He heard Lara choke on dust somewhere above and behind him.
She was still there.
Of course she was.
He had not checked where she landed, which meant the universe was doing the usual thing and making him earn the bad surprise.
The Glassman lunged again, faster now, and Kaelen raised an elbow to block on instinct.
The arm clipped his forearm and threw off the angle.
Something hard under the glass shell cracked against bone.
He grunted, slipped, and caught himself with one hand.
The room seemed to tighten.
Not metaphorically.
His chest did.
The node.
He felt it before he understood it.
Every violent move, every hard pivot, every burst of force was being punished.
The air moved thinner after each lunge, each twist, each sharp breath.
Hidden rule.
Node rule.
A nasty one.
Kaelen sucked in air through his teeth and immediately regretted it.
The chamber did not care about his regret.
It cared about cost.
He crouched still.
The Glassman kept moving, but slower now, almost feeling him out.
Kaelen heard the scrape of glass against stone, then a wet click from inside the guardian's chest.
The thing was damaged.
It was trying to compensate.
It was also, probably, smart enough to know he could not see it.
That was the smallest mercy of the night.
Lara's boots hit the floor behind him.
Not a full landing.
A scramble.
Then a cough.
He did not turn.
"Don't move," he said.
"Wasn't planning to," she snapped, and then coughed again.
Her voice was closer now.
Too close.
He finally looked over his shoulder.
She had come down the ventilation shaft in a rough slide, one hand braced against the wall, face smeared with dust and sweat, eyes red from the smoke.
She looked at him first.
Then at the dark shape moving in the smoke ahead.
It took her three seconds.
Not a dramatic three seconds.
Not the kind people write.
A real one.
Heavy and ugly and full of math.
Her gaze moved from his bleeding leg to the broken glass around him to the shape in the smoke.
She was counting.
Kaelen could almost hear it.
If I help him, I stay in this hole.
If I leave him, maybe the monster follows.
If I grab what he has on him, maybe I get out.
If I do nothing, maybe it kills us both and saves me the trouble.
A decent brain, he thought.
Annoying.
But decent.
Lara's fingers tightened on the iron bar.
Kaelen said nothing.
He did not beg.
He did not sell the situation.
He knew better.
The wrong words made people useful in all the wrong ways.
The Glassman shifted toward Lara's cough.
That settled it.
Lara saw the movement and cursed under her breath.
"Fine."
She did not rush him.
She did not ask if he could stand.
She did not waste air on concern.
Good.
She moved to the side, keeping low, and looked up at the hanging emergency lights above the chamber.
Half of them were still swinging on bent mounts.
Small bulbs.
Weak power.
But they cast enough red flicker to catch glass if the angle was right.
Kaelen watched her look.
Watched her calculate.
The memory of the generator clicked into place in her face.
She had seen enough now to understand that light and reflection were weapons down here.
Not safe.
Just useful.
Her lips pressed thin.
"You still have that ugly bomber coat?"
Kaelen gave her a flat look.
"It's torn," he said.
"Still counts."
He almost answered, but the Glassman moved again, and that stole the moment.
The guardian lunged toward the sound of Lara's voice.
She reacted first.
Not toward it.
At the lights.
She threw the iron bar straight up with one hard snap of her arm.
The bar spun, struck the nearest emergency bulb, and crushed it against its mount.
Sparks exploded.
Then another bulb shattered.
And another.
The chamber flashed in shards of red-white light.
The reflections hit the broken glass on the floor and shot across the room in ugly, broken angles.
The Glassman froze halfway through its crawl, its mirrored body catching all of it at once.
The effect was instant and brutal.
Too much light.
Too many false images.
Its surfaces flashed with a hundred Kaelens and a hundred Laras and a hundred cracks in between.
The guardian recoiled.
Kaelen did not waste that kind of gift.
He reached down with his good hand and grabbed the thick exposed cable lying half buried under debris.
It was still live.
He could feel the pulse in it.
The insulation had burned away in one place, leaving copper bright and raw.
The node was feeding through the system.
He yanked the cable free and wrapped it once around his palm.
Pain bit hard.
He ignored it.
The Glassman tried to recover and raised one arm toward him, but the light had turned it into a blind machine for just a beat longer.
Its chest shell glinted.
Its left side was cracked open from the earlier hits.
The seam between the glass plates showed the dark inner core.
Kaelen went in.
Not fast.
Hard.
He drove the cable straight into the chest crack and rammed both hands forward until the copper touched the broken interior matrix.
The guardian convulsed.
A shriek ripped through the chamber.
Not human.
Not animal.
Something in between and worse.
The sound blew dust from the walls and made Lara flinch hard enough to stumble.
Kaelen held on.
Electricity ran up his arms and into his shoulders.
The cable buzzed in his grip.
Heat came next, then a sharp punch behind his eyes as the source code tried to turn his body into a relay.
He felt his teeth clench hard enough to hurt.
The Glassman bucked once.
Twice.
Then the charge bridged the fracture and the whole chest shell locked in place.
Kaelen shoved harder.
He did not need to destroy the thing cleanly.
He needed to short it.
Burn the matrix.
Turn the guardian's own body into the fault.
The glass brightened from within.
Then went white.
The explosion was not big.
It was cruel.
The Glassman burst into a cloud of silica dust and burning fragments, the shell collapsing inward in a spray of powder so fine it looked almost soft.
A bright flash punched through the chamber.
The shockwave hit Kaelen in the chest and threw him backward across the broken floor.
He landed hard on his side.
His ribs screamed.
Lara shouted something.
He did not catch the word.
Dust rolled over the room.
Glass powder stuck to sweat on his face and in his hair.
He coughed once, then again, and felt blood in his throat.
His burned leg twitched uselessly.
The guardian was gone.
Mostly.
A few glittering fragments settled on the floor with tiny clicks.
Kaelen tried to push up and failed once, then managed it on the second try.
Lara was already looking past the dust cloud.
"Is it dead?" she asked.
Kaelen wiped his mouth with the back of his hand.
"Annoyed."
"That's not what I asked."
"It's close enough."
He looked toward the center of the chamber.
That was when he felt it.
The oxygen drop.
Not subtle this time.
The air thinned in one nasty gulp, like the room had opened a mouth and inhaled.
Kaelen stopped breathing for a second just to check whether he was imagining it.
He wasn't.
The node in the center of the chamber had woken up.
Fully.
The fiber roots pulsed brighter under the floor, and the pulse was wrong now.
Stronger.
Hungrier.
The chamber lights dimmed as if the room itself was being drained.
His lungs pulled against a tighter resistance with every breath.
Lara noticed at the same time.
Her eyes widened.
"What is that?"
Kaelen stood very slowly.
The central anchor had become visible through the smoke and dust.
A knot of cables and embedded metal set into a circular housing deeper in the floor.
It was pulling power, but not just power.
Air too.
The room felt like a lung being emptied.
A node feeding off oxygen.
Smart.
Ugly.
Efficient.
A city problem with a mouth.
Kaelen looked around the chamber and saw how the ducts fed into it.
The roots.
The vents.
The broken maintenance shafts.
The thing was connected to the whole undergrid.
If it kept drawing like this, the tunnel would suffocate.
He felt a little laugh try to form and died it before it could.
Of course the next problem was worse than the last one.
Lara took one step toward him.
"Kaelen."
He could hear the strain in her voice now.
The chamber was already eating breath.
The smoke made it feel thicker, but it was the node underneath that was pulling the actual life out of the air.
A slow squeeze.
Not fast enough to explode.
Fast enough to force bad choices.
The kind of trick an interface system would be proud of.
Kaelen looked at the node housing, then at the collapsed remains of the Glassman, then at the cable in his hand.
He had a few seconds.
Maybe less.
"Do not run," he said.
Lara barked a humorless laugh.
"That was never the plan."
"Good."
The chamber lights dimmed another notch.
The fiber roots surged.
And from somewhere deep inside the node, a low mechanical inhale began, steady and long, like something underneath the station had finally decided to start breathing back.