As the LSD takes full effect, paranoia turns into outright mob violence. Omar, who abstained from drinking sangria because he was working, is falsely accused of spiking the punch; the mob violently beats him and locks him outside in the freezing blizzard, where he freezes to death.
Lou, who didn't drink because she is pregnant, is accused by Dom and others of faking her pregnancy. The mob kicks her in the stomach, driving her into a hysterical breakdown where she slashes her own face and arms with a knife. Desperate to protect her young son Tito from the wild crowd, Emmanuelle locks him inside a high-voltage electrical room. However, in her drug-addled state, she loses the key; Tito accidentally touches live wiring inside and is electrocuted to death while screaming for help.
Elsewhere in the building, Taylor seduces and assaults his sister Gazelle, David is beaten and branded with a swastika on his forehead, and Selva succumbs to complete hallucinatory terror, stumbling through an orgy of blood, contorted bodies, and chaos.
The Ending & Reveal: The next morning, the snowstorm clears, and police officers accompanied by a sniffer dog enter the silent building. They discover a battlefield: bodies lying frozen outside, corpses inside, and traumatized survivors passed out across the floor. Psyché emerges calmly from her room, steps over sleeping bodies, and applies liquid LSD eye-drops into her eyes using a dropper. This confirms that Psyché—who claimed in her opening audition to hate drugs—was the person who brought the acid and spiked the sangria all along, watching the social experiment unfold while escaping all blame.