This is unspecified in my CS, but does anyone have a problem if Klaus has a vague ability to tell when people are magical, even if he can't pinpoint the extent or type of magical ability? He'd be a pretty poor professor of magic if he didn't recognize it sitting in front of him, and I think given his background it's reasonable that he's more finely attuned to magical presence than most, but I want to check that this isn't power playing.