 Anna theorizes Castiel must have angered his superiors, prompting him to be taken back to Heaven.When Jimmy is shot at the end of the episode trying to save his family from demons, Castiel returns, taking Jimmy's daughter Claire as his new vessel.After the demons are killed, a dying Jimmy begs Castiel to take him back as a host so his daughter will not have to go through what he did, and the angel acquiesces.