Wilbur pulls out his thread scissors, and Lucy carefully trims Rebecca's hair off, not all the way to the scalp but very, very short. It at least looks basically on purpose. Then she twists the hair into a hank and hands it to her brother, who puts it in his pocket, and starts explaining things to Rebecca like how you really don't want to sit next to a vent or go to the bathroom by yourself and the cafeteria food can be infested by poison or mals, except the brussels sprouts which for some reason are always safe, and how to store mana.