User blog comment:Chaos11394/Where Do the Demons Go?/@comment-96.225.135.231-20160101232800/@comment-3045936-20160102032643

Maybe its metaphysical issue. Castiel was nearly human when he died by Lucifer's hand. So maybe like he said when died he was "done" but was "put back". Maybe God revived him the moment he died and never went to the Empty.