He later escapes with the help of an army of angels sent to rescue him - having to begin with remained behind as penance for his actions to prevent a duo of Leviathans that ended up hoping to assault Dean and Benny as they remaining Purgatory - but the other angels not only erase his memory that they were accountable for his escape, but also erase his memory of their subsequent 'check-ins' to examine the Winchesters' actions, with Castiel.