Of Red Handbags And Vulture Topped Hats

An accident happens in Potions class. "Neville was stirring his potion frantically and muttering, "It should be red, it should be red! Finite Incantatem! FINITE INCANTATEM!" The potion started to bubble and froth alarmingly." Set in Prisoner of Azkaban; rated K. Written off prompts by my friend N.H. Complete.