Come to think of it, he was permanently high, and still more brainy than not only the regular Castiel, but also all The End other characters combined.
Maybe not so good for him, then :)

Not that any of Castiel's typical "people skills" (or lack of thereof) are to be blamed for the mistake; her wording just really was unclear in a rather clear way, so to speak.
Right, so no idiot-Castiel this time.

*points at her icon*
I thought it was a "five" (or an "S", I couldn't decide) and a handfive! Oh,my - fandoms really develop language of their own :)

Wait a minute, has Dean said "Castiel" just once? <3