Michael: Hey, you're not coming.
Sayid: Welcome back, Michael.
Michael: Look, I know Sawyer told you, all right. But, it's not going to work. You're not coming.
Sayid: And why is it that I'm not coming?
Michael: Because you're going after the guy that escaped. And I'm going after my son.
Sayid: Are you implying I'd let a desire for revenge compromise Walt's safety?
Michael: I'm implying that I decide who stays and who goes; and you stay!