Back in the present, Chase says that Kayla died a week later, and that Sam was really pissed off and filed that lawsuit. No one believes him. Stacy points out that Sam saw Chase for a follow-up exam just last week, which isn't exactly consistent with him hating Chase. Something must have happened between that last appointment and now -- something personal that would make Sam want to sue Chase and no one else, not even House. Stacy wants to know what it was.
We go back to last week. Chase examines Sam and asks about Kayla's daughters. Sam says they're kind of sad about their mother being dead and all, and the fact that Sam has to move them out of the house they lived in with their mother is sure to make things even worse. But he hasn't been able to work since the transplant surgery, and the disability checks aren't enough to cover the mortgage payments. And Kayla apparently didn't have life insurance. Smart, Kayla. Sam sincerely thanks Chase and shakes his hand. "I killed your sister," Chase says. "I misdiagnosed her ulcer. I killed her." Sam tells Chase to shut up. Kayla liked him. Chase says that when Kayla came back to her pathergy test check, he was hung-over and didn't give a crap what was wrong with her stomach. Sam knocks something over.
Back in Cuddy's office, House asks if he can have a minute alone with his "future former employee." They go outside to the patio Cuddy apparently has connected to her office, where House asks Chase why he lied to Sam about being hung-over so that Sam would sue PPTH. He knows that Chase wasn't hung-over that day; House would have fired him back then if he thought he was. So drinking too much gets you fired, but a freaking meth hangover is okay? Chase doesn't think it matters whether he was hung-over or not; Kayla's still dead and it's his fault. At least now Sam will get all the money he'll need to take care of Kayla's daughters. House says he knows what was really wrong with Chase that day. He's pretty sure who called Chase before Kayla walked in, and why.