That night, Cassie dreams of walking down a sterile hallway toward a metal door. In the dream, Cassie first sees her mother alive, then watches the scene distort into blood and violence before shifting into the memory of finding a dark room and reaching for the light switch. Cassie wakes shaken, knowing from experience that sleep will not return.

Trying not to wake Sloane, Cassie slips outside to the pool. Swimming briefly calms Cassie, and Cassie lets herself sink beneath the surface, but a flicker of movement above the water makes Cassie panic. Cassie surfaces quietly and discovers that the perceived intruder is Dean, who is also awake in the middle of the night.

Dean admits that Dean rarely sleeps more than a few hours. Cassie and Dean share a tense, honest conversation about the program: Dean insists the mall exercise with Locke was not what profiling really is and warns that Briggs should not have brought Cassie to the house because the place will ruin her. Cassie pushes back, insisting that she is not afraid to learn how killers think and is not afraid of Dean.

As Cassie leaves, Dean switches on a black light. The ordinary pool area transforms into a glowing crime scene, with fluorescent streaks, smears, and the outline of a body at the bottom of the pool. Dean explains that the victim, Amanda, was stabbed, injured when she slipped in her own blood, forced over the pool’s edge, drowned, and released into the water.

Cassie realizes the pool is another crime-scene training setup, like the basement sets, but Dean corrects Cassie: the murder was real, only relocated into the house’s design. Cassie understands that the entire house, yard, and pool were built for full immersion. Dean sees that immersion as learning a language no one should want to learn, but Cassie recognizes that she is not normal and that this staged horror is not the worst thing she has seen.