Creepy is in the eye of the beholder, in this case, at least. Zack is positively bristling in the presence of this ... person, who is decidedly not mortal. As Zack has no way of divining what powers Karan might have, he's not enjoying the encounter at all.

This, however, does make him snort, remembering Alec slipping and falling on his butt. "Tell me stuff I don't know," he grunts, adding, "or I'm walking."