 In "The Man Who Knew Too Much", Castiel tricks Crowley and Raphael, eventually absorbing the souls from Purgatory.He demonstrates his new power by killing Raphael with a simple snap of his fingers.While talking to Dean, who unsuccessfully begs him to give up the power, Sam sneaks up behind them and attempts to kill him with an angelic blade by stabbing Castiel in the back, but it has no effect.