Honjo had stopped and turned around to face her, just to see her reaction. When he saw that smile and watched as she started to give chase, he laughed and turned on his heel running. Not as fast as he could though. He was a rather fast runner. He had plenty of practice...
But this was different. This was fun! This was silly. And really, that was the point of it. To cheer her up and do something childish. They didn't have anyone to tell them off for it, so why not?