On this episode of Supernatural…

Lily Sunder attacks and kills an angel.

Castiel meets up with Ishim, one of his former war compatriots, to find out why angels are being killed.

Lily finds them, but they manage to get away.

Ishim reveals that he and other angels went to kill a nephilim, the child of Lily’s and an angel, long ago. They kill the angel and the child.

Lily reveals that Ishim was jealous and obsessed with her. He killed a human child, not a nephilim.

They fight, and Castiel manages to kill Ishim.

He tells Lily he is willing to accept the consequences, but he didn’t know the truth.

Lily leaves.

Sam, Dean and Castiel hope to find a way other than killing Lucifer’s baby.