For almost as long as he's been on the show, Cas's first priority has been the Winchesters. Even when he appeared to be betraying them, ultimately it was FOR them. His part at the end of this episode just about made me cry. <3 <3 <3 Love how much he loves the boys.

Totally agree that I'm SO glad they didn't take the obvious, awful route of killing off Mary in that way.

Sad to be losing Billie, though. :/