Jesse didn't like that Buffy was moving away from him. She didn't look good, she looked like she needed help. A lot of help. He ran faster, not looking where he was going or what he was doing. He needed to get to her. He could protect her. Even if she didn't really want it, he was going to do it.
Then he heard his name being called and recognized Zoe's voice. He turned in her direction, slowing to a stop.
"Keep them off of her, okay?"
He wasn't paying much attention to his surroundings.