Salvation tag
The walls are closing in on all three Winchesters the closer they get to the demon that ruined their lives. They're losing people they cared about and all of them are unacceptable losses. Nothing's ever going to be the same after this, no matter what happens next.
Sam is chomping at the bit now and acting irrational but he's past the point of caring even though he knows he's hurting Dean, which is the last thing he wants.
Dean doesn't want to lose his brother and father, and he's absolutely terrified he won't be able to stop their suicide missions.