"I saw you a few buildings over. Thought I'd stop by and see what was up." She didn't mean to make him feel uncomfortable or self-conscious. "What were you practicing anyway? Electrokinesis?" She didn't want to pry too much, but it was a safe assumption she felt. He could have been a mutant, he could've been something else. Billy didn't look like he had any gadgets attached to his wrists so he wasn't a tinkerer or the like.
She was trying to come off as accepting in her inquiry. She didn't have any powers herself, but it didn't mean she couldn't admire someone else's, especially if they'd be useful. This was a little different than her experience the other night, but he didn't attack her. He seemed to be cool with 'good guys', as he called her.