Chapter 3 - THE OXYGEN MASK AND THE PHANTOM CODE"Explain," Callum ordered, his dark eyes locked onto hers with absolute intensity.
"The central oxygen line for the entire private wing runs directly beneath this catwalk," Sarah said, tapping a heavy iron valve marked O2-SECTOR 7. "If we vent medical-grade nitrogen gas into the floor vents of Room 714, it won't kill anyone, but it will drop the room's oxygen saturation to a safe, controlled state of sudden, deep unconsciousness within forty seconds. Everyone inside will drop like stones—including Captain Vance."
"And Leo?" Callum asked sharply. "The boy's lungs are already compromised."
"That’s why I have to go first," Sarah said, pulling her stethoscope from her pocket and wrapping it securely around her wrist like a tourniquet. "I have a portable oxygen rebreather in my emergency locker down on three, but we don't have time to go back. You’re going to give me your tie."
Callum didn't hesitate. He ripped the silk tie from his collar and handed it to her.
Sarah tied a makeshift filtration mask across her nose and mouth, dampening the fabric with a vial of sterile saline from her scrub pocket. "When I trigger the valve, count to thirty. Then kick the vent open, drop behind the privacy curtain, and hold your breath. Do not breathe a single lungful of that gas, or you'll be joining Vance on the carpet."
"And if Vance manages to fire his weapon before he goes down?"
"Then," Sarah said, her voice dropping to a fierce, unshakable whisper, "you'd better have good aim."
She twisted the iron valve.
A sharp, hissing roar filled the ductwork. Invisible, odorless nitrogen cascaded downward into Room 714 like a silent avalanche.
Sarah counted silently in her head. One. Five. Ten. Fifteen.
Through the mesh, she saw Captain Vance suddenly stumble, blinking heavily, his hand reaching for his holster in slow motion. He shook his head, trying to clear his vision, but his knees buckled. He crashed face-first onto the linoleum floor, his service pistol sliding across the tiles.
Thirty.
The vent cover blew inward with a dull, metallic crash as Callum dropped from the ceiling with the precision of a striking hawk. He hit the floor soundlessly, rolled twice, and covered the distance to the bed in a single heartbeat.
Sarah dropped down right behind him, instantly rushing to the IV pole. She slammed her thumb onto the emergency stop button of the infusion pump, ripping the poisoned line out of little Leo's arm just as a lethal drop of potassium hit the chamber.
"He's stable," Sarah panted, tearing off her makeshift mask. "Pulse is weak, but he's breathing room air now. We have less than three minutes before the floor guard wakes up or backup arrives."
Callum carefully lifted his son into his arms, wrapping the boy in a thermal blanket. Leo stirred slightly, his small hand clutching the lapel of his father's charcoal suit.
"Dad?" the boy whispered, his voice heartbreakingly small.
"I've got you, Leo," Callum murmured, pressing a fierce kiss to his son's forehead. He looked up at Sarah, his eyes burning with a dangerous, unspoken promise. "We’re leaving. Now."
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"Wait," Sarah said, freezing as she looked at the computer monitor on the nurse's station across the room. "Look at the screen."
The glowing monitor flashed a bright red alert: BIOMETRIC LOCKDOWN INITIATED. ENCRYPTION KEY REQUIRED TO CLEAR EXIT GATES.
