Billy's feet were already lifting off the ground under the power of his magic when he heard the voice. He spun to face her, not dropping to the roof this time like he'd done with Loki. He was getting better control, if only slightly. Though she was difficult to make out in the darkness, Billy located Hawkeye quickly enough.
The energy crackled around him as he hovered in place. He shrugged, feeling a little self conscious. Here he was, in normal, everyday clothing, hovering in the air at night on a rooftop. It might have made more sense if he had a costume like she did. He really needed to get a costume if he was going to consider this superhero thing. Nothing said imposing like a button up shirt and jeans.
"It can be," he finally replied before touching down, waving his hand in a welcoming gesture. "You hunting tonight?" He pointed to the quiver on her back as he asked his question.