Illya looks at her, torn between amusement and annoyance. A lamp to the head might hurt, yes, but it was hardly going to incapacitate a trained solider. Not that someone so young would know that. And she was obviously scared. Which didn't make it any less troublesome, but.

He shakes his head, motioning with his hand for her to keep her voice down. Then, he speaks quite calmly.

"I saw a man following a girl. So, I followed him. I know what magic looks like, so I know you used it. Is that sufficient?"