So after the commercial break, Walter adjusts his hypothesis: it's not that Lisa's mind was harbouring Rusk's memories, it's that Rusk's entire consciousness was transferred to Lisa. "Perhaps his soul." He says Lisa is suppressed in her own mind. Ms. Donovan wants to stop the experiment, and Walter points out that they gave her drugs, which have taken effect, so they can't exactly just stop the experiment. Astrid suggests she and Ms. Donovan go out and get some air, and I can't IMAGINE leaving my daughter without a parent in a situation like this -- "my child is possessed by the spirit of a dead man? Yeah, think I'm going to go stretch my legs" -- and I don't buy Ms. Donovan doing it, but Walter scolds her, telling her to let him do his work. "I can't lose her again," says Ms. Donovan. Walter, a lot more nicely, tells Ms. Donovan that she's going to be fine, and she leaves the lab with Astrid.

So Olivia tries talking to Rusk, who wants to be let go. Olivia asks Rusk who killed him, and after a long while, Rusk explains he told his wife he was going for a beer, and there was someone in his back seat who told him to pull over and walk. So we have Lisa speaking in the voice of Rusk who is now relating someone else's dialogue. Whoa!

Lisa struggles against the straps, and Rusk says he doesn't know his name: "Just his blood. His left arm." Then she seizes up again, and loses consciousness. Peter turns off the drip while Olivia says she's going to call the local hospitals and see if anybody's gone in with an injured left arm. Here's hoping only one person in the greater Boston area hurt their left arm in the last few days, hey?

Sometime later, a sleepy Lisa calls for Peter, who announces to everyone that she's coming out of it. "Did it work? Is he gone?" she asks. Peter starts unstrapping her, while Olivia gets a phone call from Ghost Charlie, who tells her that hey! One person in the past few days hurt his left arm! Jake Selleg, 36, walked into a Roxbury ER three nights ago. "Jake Selleg was Navy too, OK? Now, he trained with SEAL Team Six. That's counter-terrorism." Well, that's quite the coincidence! Olivia says, "That can't be a coincidence." Oh. Charlie tells her Selleg works at a boxing gym in Dorchester.