Harry Potter and the Prisoner of Azkaban attacked by a big black dog, which Harry has seen several times before. The dog drags Ron through a tunnel under the Whomping Willow into the Shrieking Shack. Harry and Hermione follow, and there is a brief standoff when they find Ron with Sirius Black, who has transformed from the dog. Lupin enters, and they explain the situation to Harry and his friends: Lupin is a werewolf, which led to his friends James Potter, Sirius Black, and Peter Pettigrew becoming animagi. Lupin explains that Scabbers is Pettigrew in his animal form; he has been hiding from Black, whom he had
Harry Potter magic. I so understand why Voldemort wants to conquer death. We're all frightened of it." Rowling stated that ""Harry Potter" books have always, in fact, dealt explicitly with religious themes and questions" and that she did not reveal its Christian parallels in the beginning because doing so would have "give[n] too much away to fans who might then see the parallels." In the final book of the series "Harry Potter and the Deathly Hallows", Rowling makes the book's Christian imagery more explicit, quoting both and when Harry visits his parents' graves. Hermione Granger teaches Harry Potter that the meaning of