Back at the safehouse, Cas is greatly weakened by healing Ishim's wound from his fight with Lily. Dean finds him and tells him Lily's daughter was human and that he thinks Ishim is playing them. Ishim returns and when Cas confronts him, Ishim tries to turn Cas against Dean. Dean attacks Ishim, who throws him against the wall, then begins to fight with Cas. Dean draws an angel banishing sigil and threatens to use it, but Ishim tells him that using it would probably kill Cas in his weakened state so Dean stops. Lily and Sam arrive; Sam rushes to Dean and Lily fights Ishim, finally using her power to hold him long enough for Cas to kill him. Cas apologizes to Lily and tells her that if she decides she can't forgive him, he'll be waiting.
Back at the Bunker, Dean tells Cas he's not weak for being their friend and explains that he's not mad about him killing Billie, he's just worried about the consequences. Cas acknowledges his concern but still does not regret doing it even if it costs him his life. Dean then asks him what he's going to do about Kelly and the Nephilim she's carrying. Cas says that while he knows a Nephilim is dangerous, he's not sure he can kill her. Dean asks what they're going to do, and Cas suggests they drink and hope they can find a better way.
===[[:Category:Season 13|Season 13]]===