Psychological Horror Captured in a Single Tracking Shot

one-take cinematic horror scene, old apartment hallway at night, one young woman holding a phone light, slow tracking shot, tense silence.
first step: ceiling light suddenly goes out, brief blackout, light returns, hallway seems normal.
second step: light goes out again, slightly longer blackout, faint strange sound, light returns, bathroom door is now more open, her breathing becomes faster.
third step: she hesitates in fear, then takes one more step, longest blackout, eerie low laugh in darkness, light snaps back on, a pale inhuman figure is suddenly standing motionless directly in front of her face, intense dread, cut to black.
realistic, oppressive, restrained, psychological horror, cold green and dirty yellow lighting, shallow depth of field, film grain, high-end horror movie quality.