Kevin Bacon continues to roam above them in the ducts, as Chuck tells Sarah and Casey how grisly Lewis's body was. They figure they better finish this. When they find the rest of the group, though, Jody and Robin Givens have their guns trained on each other, each one saying that since she know it's not herself, it has to be the other. Casey tells them to put their weapons down, so they draw their guns on Sarah and Casey, in case it's them. Robin Givens asks Chuck, condescendingly, who the killer is, since he's the leader. Chuck flashes back, in black and white, on what might have happened. When he's done, he says he knows who did it. He explains: At first he thought his second choice would want to kill his first choice (Jody, weeping: "So I'm not your first choice or your second choice?"), but they're both dead now. He says he did suspect Jody for awhile because of her volatile emotional state. But he says he found her pregnancy test in her things; she's expecting. He says that brings him to where his suspicions have been pointing this whole time. Robin Givens tells him he must be joking, as they all close in around her. Chuck says that only one person was unaccounted for during both murders, and she has unique access to Castle's infrastructure. Robin Givens tells him to be careful. Chuck whispers that he knows it isn't her. Casey's like, "What?" Chuck says she had ample opportunity to kill him and didn't; he just wanted everyone to move in on her because it got them away from the real killer: Damian, who's probably armed. They all say they've got Chuck's back, but Damian stands up and says he'd like to go with Plan B.
They all point their guns at Damian, who tells them they're going to let him out or else. He opens up the boom box to reveal it as a bomb. Chuck's like, "I should have realized that." Then he explains -- and we see in black and white -- what happened: Brody saw Damian planting the explosives, so Damian killed him to cover his tracks. But once it was locked down, Damian knew it was only a matter of time before they figured it out, so he really committed by blowing himself up. But that locked the doors, so Damian tried to get a killer on their minds by planting the chair bomb during interrogation. So now they know what he did, but not why. They ask him what he's after, and Damian says he came here for Chuck. Creepy. Damian says they're going to get him out of here, but Chuck says he can't let him leave. Robin Givens shoots Damian in the leg, and he drops the boom box, activating the bomb, which is supposed to go off in one minute -- too little time for Chuck to deactivate it. Plus, I haven't seen any fruit juice.