Kate: What happened?
Jack: He killed them. Bernard, Jin, Sayid, all three of them. He radioed the beach and I let it happen -- I had to let it happen. We can't tell Rose or Sun, not yet. We've got to keep moving. I promised Sayid we'd keep moving.
Kate: Why did you bring him back? Why didn't you just kill him?
Jack: Because I want him to see it. I want him to experience the moment we get off this island and I want him to know that he failed. And then I'll kill him.