Back at the motel, Castiel appears to Sam. Castiel is so drunk he can barely stand straight. Sam brings Castiel up to speed on the situation in Blue Haven, and Castiel shocks Sam by revealing that Leah is not a prophet.
Dean comes back to the motel the next morning, covered in Paul’s blood, surprised to see Castiel (“Where the hell have you been?” “On a bender.”). He sets matters straight: Leah is the Whore of Babylon, who rises when Lucifer walks the earth: “And she shall come, bearing false prophecy. This creature has the power to take a human form and read minds.” The real Leah has probably been dead for months; the demons are under her control and the exorcisms fake. And the reason why Leah is doing this is to lure the people into performing acts – like Jane killing Paul – that will send them to hell. The way to kill Leah is to drive a stake made of a cypress tree from Babylon into her. But this has to be done by a true warrior of God, and what with Castiel rebelling against Heaven, Sam going demon-blood crazy (“Sam, of course, is an abomination”) and Dean losing hope, the only true warrior at hand is Reverend Gideon.
At the church, Jane is seeking comfort from Leah, and her father is deeply troubled by what she is telling Jane. He is even more troubled when, at church, Leah tells the congregation that there are a couple more sinners left in the community that need to be taken care of, i.e. burned alive. When the Reverend tries to stop her, Leah threatens to expose him as a sinner too.
A bewildered Reverend Gideon has his world spun on its axis when, after Castiel brings him to the motel room using his power (thus convincing him he’s an angel), he is told who Leah really is. As the small band prepares to go face Leah, Dean gives Castiel aspirin to help him with his hangover; Castiel admits that he doesn’t know how Dean handles having a deadbeat Dad.
Under Leah’s supervision, the ‘good’ townsfolk are herding the ‘bad’ ones into a basement closet, including kids. But when Leah tells them to burn them alive, Jane and Rob realise that something is wrong. Leah heads over to Gideon’s office and is ambushed by the foursome. But Gideon wavers as ‘Leah’ begs her father not to hurt her, which gives her enough time to overcome Castiel, Gideon, and the Winchesters. Leah runs back to the basement where she turns the townspeople against Gideon by claiming he’s a demon. A fight ensues and Leah straddles Dean. As she is choking the life out of him, he reaches for the stake and runs it through her. To everyone’s surprise, including Leah’s, it kills her; Dean somehow still qualifies as God’s warrior.