Lost, Season Three

Kate:
What happened? What'd he say?

Jack:
It's not important right now. Just, get everything together...

Kate:
Jack, your knuckles. Here

[Kate begins cleaning his bruised knuckles]

Kate:
What happened?

Jack:
He killed them. Bernard, Jin, Sayid, all three of them. He radioed the beach. And I let it happen. We can't tell Rose. Or Sun, not yet. We gotta keep moving, I promised Sayid that we would keep moving.

Kate:
So 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 that we get off this island, and I want him to know he failed. Then I'll kill him.