Ep. 5: Rachel and Zack escape gas room, face Zack's violent drug-induced episode

Rachel retrieves a keycard from an air vent, but Zack breaks it while opening a door as toxic gas fills the room. Rachel ignites the flammable gas to explode the door, allowing both to escape. Exhausted, they rest, during which Zack recalls his abusive childhood. In the next room, a dollhouse puzzle forces Zack to relive these traumatic memories, increasing his anger. They then encounter two syringes, one safe and one dangerous. Zack injects himself with both, causing the drug to make him aggressive and threaten Rachel's life. Rachel appeals to their previous agreement, asking if he truly intends to kill her. This reminder calms Zack, who then instructs Rachel not to let him kill her, ensuring he does not break his promise.

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