She doesn't start screaming, so that's a good start. In fact, she's apparently seen magic before, though she uses the word enchanter instead of wizard. People in Darrow have all sorts of weird names for the things he can do, so he's mostly used to it by now.

He can't help but grin at her when she says she hasn't seen it before, and maybe he gets a little bit of a kick out of this, but he thinks he can be forgiven. He remembers the first time he showed Julie magic, how excited she'd been, and he sometimes wishes everybody could share in that. Magic has always been part of him, present every day of his life, but he's seen the way Muggles look when they see magic for the first time, seen the looks on the muggle-born first year's faces when they first arrive at Hogwarts, and sometimes he wishes he knew what that felt like.

"Where I'm from we call ourselves wizards," he explains, nodding a little. "It's supposed to be a secret, I guess, but this city is full of nonsense, so." It's probably not even the strangest thing she's seen here. The day those Muggle toys had come alive and started trying to kill everybody was pretty high up on James's list, and he's seen a fair amount of nonsense. "Used to," he says with an unabashed smile. "Now I'm one hundred percent a responsible and productive member of society. Or something."