Horror Hallway Chase with Radio Static

15-second continuous handheld tracking shot. The camera follows tightly behind a young man running down a narrow, flickering hallway. He is breathing hard and speaking in short, panicked bursts into a radio: "It's still behind me - I said it's still behind me!" A distorted female voice answers through static: "Don't turn around. Whatever you do, do not turn around." He keeps running, voice cracking: "It's whispering my name - why does it know my name?!" The voice replies, almost calm under the static: "Because you already let it in." Continuous shaky forward movement, emergency lights strobing, heavy breathing, claustrophobic energy.