Probably! He might be turning into one, but it's the monster thing that's putting him on guard. It'd be a definitely if Xander wasn't like, the first monster he met, and thus the monster form is pretty far lodged in there in his impressions. But it's still a probably, so odds are good.

If he tells Sandra something and she already knows, then well, at least he's shown he's been paying attention. But he will try and pay attention to mannerisms, speaking style on the network— growing up as part of a set of sextuplets, he knows how obnoxious it is to get confused.

Of course, his monster is fairy so eventually he'll be able to go between bavan and vandare with no problem with fairy rings.