Castiel couldn't allow the world to end--he wouldn't--not after what the Winchesters had gone through and not while the world was still their Father's beautiful creation. Humans were flawed, but no more flawed than angels. He didn't know why the other couldn't see that.

"No, you only pretend to be. You speak for yourself. You don't care what He wants any more than you care what I want." He shook his head. "I loved Michael once, too, but I can't stand back and let either of you destroy everything He left to us."