Cal honestly didn't mean to run into her, he just hadn't noticed the smaller girl in his way until it was too late. He manages to keep on his feet, but he's lost his momentum and the instinct to stop and apologize cuts through his panic somewhat.

He ends up turning to face her, holding his hands up pleadingly. "Sorry! Sorry, I'm just - I have to get going!" Even as he says it, he's backing towards the other end of the alley that promised an easy escape route. Cal isn't even thinking about how suspicious he must look, not with the threat of arrest or 'containment' looming so close. It's not the police he's afraid of, not exactly, but it was the kind of trouble that could lead to something far worse.