Snape and Sirius Clash Over Occlumency Lessons
Pages 519-522
Snape announces that he will be teaching Harry Occlumency. Sirius and Snape exchange insults, with Sirius accusing Snape of mistreating Harry and Snape mocking Sirius for his inaction within the Order. The argument escalates, and both men draw their wands before being interrupted by the Weasley family.
