"Gods, no!" Katie exclaimed the words instantly, wrinkling her nose at him. Almost out of habit, she reached out a food to nudge his leg as she added, "Ew. You're crazy. That would never have worked anyway. I'm too blond, they wouldn't have believed it." Okay, so she was making light of the situation, but that was kind of what she did. (Of course then she was sort of wondering if there were any blond Death Eaters, though Merlin knew why...)