How we cite our quotes: All quotations are from Harry Potter and the Prisoner of Azkaban.
Quote #1
[The black dog appears in the park.]
When Harry flees from the Dursleys, he thinks that things can't get much worse. But being alone, in the dark, and encountering a snarling dog is pretty freaky. Not enough to make a room in Uncle Vernon's house look appealing, but still scary, and quite a way to start the movie.
Quote #2
STAN SHUNPIKE: That is Sirius Black, that is. Don't tell me you've never been hearing of Sirius Black. He's a murderer. Got himself locked up in Azkaban for it.
The threat of Sirius Black hangs over Harry even before he gets to Azkaban. Even before we learn that Sirius might be targeting Harry, we're still nervous that a deranged maniac is on the loose.