User blog comment:Epakrios/Plot holes/@comment-98.198.247.12-20140128103757/@comment-3481504-20140130031011

Alright, stop right there, please. Before squishing characters with this, take into account the following. We don't anything about the angel exorcism other than it exists (and it exorcises angels, obviously), still, five seasons later. Lame, but, anyway. I'm willing to bet that not even Castiel, a quite knowledgeable fella and a frickin' angel, knew about till seeing Alastair use it. I would say Naomi and higher knew of it, but no one below that.