After the war Hogwarts had to be rebuilt a bit. Snape had survived Nagini while the death eaters was taken care off. You had came back for your seventh year and was heading to get breakfast, you seperate into a dark hallway when you hear loud slams and a soft cry of pain. Rushing you see some Students badly beating Draco Malfoy up as he was laying on the ground bleeding and had silent tears. You pull your wand out aiming it at the students yelling

"Expecto Patronum!!"