Excellent chapter. The Lilith!Dean part was an unexpected twist, and chilling, esp this line He was beautiful, enough to make Bobby's blood turn to ice. -- He had known Dean since he was eight years old and for all that he was pretty whatever was in that room with Sam was so beautiful it was horrible and it was not him.

I wonder what made Sam realize that that wasn't Dean. I do hope we're going to be told about that!