Well, he's already hinted at the sort of magic they have in his universe: the charming, fairy-tale, spellbook kind. She shouldn't be surprised that he thinks there could be chanting involved.

It also occurs to her, far too late, that there's really no way for her to explain how she knows about said skill without also indirectly admitting she's used it. And he knows, now, what most vampires from her universe are like. This could get uncomfortable.

More uncomfortable, that is, because there's plenty of inherent discomfort in admitting, "We'd have to be touching, but that's all. No chanting or… or wand waving." Or whatever else constitutes magic handling in Spikeville.