Wilson all but begs House not to do this, but House says an emotional plea is not a sound argument. Wilson kicks something and storms out, only to walk back in. This time, he looks a lot less angry and much more sad. He admits that Cuddy was right that he wanted to keep CTB frozen because he thought it could make everything stop. House nods and says CTB will be okay. But Wilson didn't just come back to apologize -- he has a favor to ask. And it's a doozy, as we can tell by Wilson's reluctance to even say it. But he does. He asks House to try that electric brain zapping thing he suggested before to recover his memories so he can be absolutely sure that the rash was the symptom he saw before the crash. Wilson is afraid that there's another symptom out there that they're missing, the one that could be the key to a definite diagnosis. House thinks for a minute and it looks like his eyes tear up and he's kind of human. He asks if Wilson is suggesting that he risk his life with the brain zapping thing to possibly save CTB's. Basically, he's asking if Wilson is saying that CTB's life is more important to him that House's. And guess what? It is. Which means House might as well do it, because he has nothing left to lose.
Chase the surgeon is somehow responsible for this delicate brain operation. He drills holes in House's skull while House stares at Wilson, possibly willing him to change his mind. But Wilson doesn't, and Chase sticks the electric probe into House's brain. Wilson turns it on, but all House sees is a black-and-white shot of Fred with no sound. Can memories really do that? Lose sound and color as they fade away? I have a photographic memory so I honestly don't know. It's either there or it's not for me. There is no in-between. House orders Wilson to jack up the voltage so he can see and hear everything. Wilson does, and the flashback is complete.