In the last scene, Patterson is pressed against the bars of his cell, screaming and pleading that he is innocent, while the camera focuses on a gargoyle drawn in blood on the wall of his cell. Earlier in the episode, Mulder told Scully that he and Patterson disagreed on the best way to investigate serial murders, and Patterson always tried to empathize with the suspect, imagining himself in the killer's place. Mulder's closing narration concludes that it was this that eventually drove Patterson insane, but Mulder cannot account for what he saw while fighting Patterson.