The Incident by the Whomping Willow

During their time at Hogwarts, Snape and Lily argue about their friendship. Lily is uncomfortable with Snape's association with students like Mulciber and Avery, while Snape defends their actions as harmless fun. Snape's obsession with the Marauders also puts a strain on their relationship, especially after James Potter saves Snape from the dangers of the Whomping Willow.