 Before Samandriel can explain, Naomi forces Castiel to kill him for being a "traitor".Castiel is horrified by this, but Naomi reveals that Samandriel telling Crowley about the angel Word of God tablet puts all in angels in danger and Castiel is a hero.Under her orders, he claims to Sam and Dean that he was forced to kill Samandriel in self-defense and that he is taking him back to Heaven to put him to rest (in reality so Naomi can determine just how much he broke), but his weird behavior and the fact that his eye starts bleeding arouses Sam and Dean's suspicions that he is being controlled.