It was not normal for someone to tell her (or any other person for that matter) outright they'd had a dream about her recently. Especially seeing as she was certain she didn't know him (though she knew of his relatives).

As they went through the motions of the dance, Cora's expression faltered and she leaned away from him instinctively. "I don't think that's an exceptionally appropriate topic to start with during a dance, Mr. Zabini, do you?" she said, an edge to her voice though she fought to keep her expression neutral. "Plus, how could you have had a dream about me, we've never met to my recollection."