 In a flashback scene, Dean is shown looking for Castiel in Purgatory, interrogating a vampire for his location.As a result, he meets Benny and only agrees to Benny's deal to get out if they find Castiel first and help him escape too.Castiel appears in flashbacks in the following episode, where he reveals that he fled Dean to keep him safe from the Leviathans and other monsters that are angry at Castiel, but Dean refuses to leave Purgatory without Castiel.