So now new guy has duct tape on his mouth, at least until Jesse rips it off to ask who he is. The guy, rather scared, says he's name's Charlie Fischer, and he works at SRF -- Seismic Retrofitting. He's just a service technician who has no idea why he's here. "Tell him who you are," Jesse instructs Paul, who says that he's told them who he is, and accuses them of playing a trick on him. "And you're in on it!" he tells Charlie Fischer. "What do you want from me?" he yells at Jesse, who then starts pounding on him some more, which freaks Charlie out more than it does Paul.
Outside, Derek tells Jesse that even if this guy is who she says he is, they need to find out why he's here. Maybe he's AWOL like you, he suggests, and Jesse rejects that, saying he's got to be here for a reason. She nestles her forehead against Derek's temple and gets all Lady Macbeth on him, saying, "You need to beat the hell out of him. You need to get him to talk."
I guess nothing motivates Derek like his old lady getting on his case, because he marches right back in and grabs a pair of pliers or wire cutters or something, goes over to Charlie, grabs a hand, and starts cutting or yanking or something. It appears to be very painful. Even Jesse is looking on in horror, and she's the one who wanted Derek to go all Hostel on his ass. "Don't hurt the boy!" says Paul. Derek prattles on, some nonsense about how "you can beat and beat some people all you want but they hate themselves so much that they just absorb the pain," and eventually Paul admits to being Charlie Fischer. Well, of course he is. It's Richard Schiff, after all. Young Charlie looks on in horror. I'm really going to lose my hair, you can see him thinking. Jesse looks at Derek, all, "You owe me a Coke."
Old Charlie says he's not here on a mission, but as a reward. He says he was locked up in Pelican Bay when the bombs dropped, and when the terminators got their hands on him, it was either tell them everything he knew, or say goodbye. "And what'd you learn?" asks Derek. "I learned what makes people tick," he says. Enraged, Jesse flips the chair over, and Derek has to stop her from beating him to death right there.