Don't forget that Sally-Anne said that that there was someone else, who was bothering Katrina Bundy. I guess that means he might be in Gryffindor.

I've asked Evelyn to keep an eye out. Not using your name at all, Sally-Anne, or Katrina's either. I just told her that I heard something that made me wonder if there was anyone who was bothering the younger girls. I didn't say any more than that. She promised that if she learned anything, she'd let me know.