Tilly was super alarmed by this but mostly because she had to CUT OPEN THE TOP OF HER BEAR. She tried her best throughout class to master the spell, but she was having difficulties with it at first. It was disgusting to her every time the jello-like the brain was getting, but eventually, by the end of the class, she was successful enough in that the bear actual slowed down and fell over. She was promptly horrified after that, though. YAYYYYYYY DARK ARTS.