"Not unless I used my Sight. Or a detector. Half-demons end up with human blood clouding the air and magic."

harry nodded, and took out a notebook, taking notes. Then he slipped it away.

"I'm kind of an odd duck, even for wizards. Ever since I fell through time, my magical senses are enhanced." He nodded again.

"In my world, vampires don't play nice, most of the time. One group decided to play very not nice and declared war on the wizards, and on me in particular. They tried to annihilate my bloodline and I turned the spell back on them."