And he had followed her through use of the shadows the entire time. Once he was sure she was comfortable and not going anywhere, he stepped outside of the classroom and opened the door to let himself in. Before anyone could do anything, he mumbled a few words. The effects were immediate and spread outward from him. Everything in the classroom became coated in pure black except for the people, who remained frozen in place. All of them, except of course, the girl. 

For a moment, still in his human form, he watched her before sighing deeply. "Running is useless you know. And it's annoying."