 Castiel informs Dean he can't interfere due to how important Prophets are, but he impresses upon Dean how the archangel protecting a Prophet will intervene if said Prophet is in trouble to secretly let him know a way to save Sam.In "The Rapture", Castiel enters Dean's dreams and arranges a meeting to tell him something important.However, when Sam and Dean go to meet him, they instead find Jimmy, Castiel's vessel, who claims to have little memory of his life as a vessel.