Character = Image1
1 (0–1s): Power cuts in dim apartment hallway; A’s phone flashlight activates.
2 (1–1.8): Wide stairwell; weak emergency lights flicker, residents emerge confused.
3 (1.8–2.6): Resident below convulses near open door; veins darken rapidly.
4 (2.6–3.4): He turns with clouded eyes and violently attacks a neighbor.
5 (3.4–4.2): Screams echo upstairs; residents freeze, flashlights swing downward.
6 (4.2–5): A peers over railing, briefly seeing chaos below.
7 (5–6): Infected convulses at stair base; residents retreat inside.
8 (6–7): Infected rises and races upstairs unnaturally fast.
9 (7–8): A backs away, realizing infection is climbing toward her floor.
10 (8–9): Wide stairwell; flashlight beams crisscross in panic.
11 (9–10): Neighbor from 4B warns everyone to lock themselves inside.
12 (10–11): Infected reaches third floor and attacks a resident.
13 (11–12): A slams and deadbolts her apartment door.
14 (12–13): Close-up: door number “5C” illuminated by flashlight.
15 (13–14): Infected pound and claw outside; A retreats into darkness.
16 (14–15): Newly bitten resident turns rapidly, veins darkening, joins the climb.
17 (15–16): Horde surges upward through dark stairwell.
18 (16–17): A grabs heavy flashlight and cast-iron pan, bracing by door.
19 (17–18): Door splinters under pounding; A retreats toward window.
20 (18–19): Neighbor from 5D tells her to use the shared balcony.
21 (19–20): A climbs onto narrow balcony ledge, flashlight in teeth.
22 (20–21): Her door bursts open as she reaches neighbor’s balcony.
23 (21–22): Neighbor pulls her inside and locks balcony door.
24 (22–23): Wide stairwell; infected continue climbing floor by floor.
25 (23–24): Close-up: A grips cast-iron pan as pounding starts again.
26 (24–25): Door bursts open; A strikes first infected with pan.
27 (25–26): Both shove a bookshelf against the doorway as barricade.
28 (26–27): Pounding continues; flashlight battery begins fading.
29 (27–28): Exterior wide shot; flashlight beams flicker through windows across floors.
30 (28–30): A and neighbor huddle in darkness; flashlight dies, distant pounding echoes. End on tense cinematic vertical-horror shot.

Style: realistic found-footage horror, handheld camera, natural human motion, oppressive darkness, practical flashlight lighting, escalating panic, seamless continuity, no gore emphasis, cinematic sound-driven tension.