15-second cinematic psychological thriller, empty office hallway at night, one middle-aged man in da

15-second cinematic psychological thriller, empty office hallway at night, one middle-aged man in dark office clothes, static symmetrical camera, realistic fluorescent lighting, grounded photorealism. The man walks slowly down the hallway and stops. His shadow continues walking independently along the wall for several steps. The man turns toward it. The shadow stops and slowly turns its head toward him while the real man remains still. Fluorescent lights switch off one by one behind him. Brief darkness. When the final light turns back on, the hallway is empty, but the man's shadow remains standing alone on the wall. Minimal movement, realistic acting, subtle tension, restrained surrealism, no monsters, no gore, no visual effects glow, no text, no extra people.