Mack: We lost Fitz again huh? He out there chasing down another ghost story?
Bobbi: He has a theory.
Mack: He's always got a new theory. That's why he locked up that damn rock and won't let anyone in.
Bobbi: He wouldn't dare go in there. He's not totally irrational. The process of digging just helps him cope.
Mack: No, it keeps him from coping. Look, I love the fact that he won't give up hope. I do. But the man's a scientist and the evidence is pointing one way.