Alastair is eventually set free of his bonds by an unseen force .
Alastair is eventually seizes the opportunity to attack Dean and Castiel , but is incapacitated and tortured by Sam , who forces him to admit that demons are not involved in the angel murders .
Alastair is eventually set free of his bonds by an unseen force and seizes the opportunity to attack Dean and Castiel , but is incapacitated and tortured by Sam , who forces him to admit that demons are not involved in the angel murders .