[Flynn perks up, eyebrows climbing as he listens to his explanations.] I disagree, this actually just got interesting.

[Because even if this Castiel is a crazy person, he is obviously a very scholarly crazy person. If asked, Flynn probably wouldn't be able to say why exactly he draws the line at actual angels, he just does. After everything he's learned today, he needs something he can be in denial about - and he knows too much magic for it to be the town.]

Yes, I know the Language of the Birds. [He frowns.] I suppose an angel would find that interesting.