Carrie
I understand. I'm worried about him and I'd never met him before that.
And no. Even when my powers were out of control, I never had any effect on people around me. But she had more training with her powers than I did.
You might want to ask Erik Lensherr. He's my father, and we have the same powers. He'll know more about our capabilities than I would.
Theoretically, if I manipulated electricity I could excite his nerves, which could have made him pass out. But it surprised her when it happened, so I have no idea if that's what happened. It seems likely, anyway. Or I could have slowed his circulation using the iron in his blood, but that would take too long, and he passed out right away.
Unless he just fell over and banged his head on the floor. Which is entirely possible too.