I don't think Cas was uncomfortable about that. I thought he was just trying to use kewl lingo link Dean tried to teach him that time.

Yeah if I was Jo. I wanna hit Cas so hard lemmetellya!

Also I liked Jo and Ellen's death. it was very honorable and full of heart. It would have been kewler if they had been put on for more episodes though.

Cas Didn't kill her ... she just fell in the fire. :X

yeah burning the picture. WTF? I don't know about forgetting I don't think they especially Bobby could.