How we cite our quotes: All quotations are from Harry Potter and the Prisoner of Azkaban.
Quote #4
RON: Where did you come from?
HERMIONE: Me? I've been here this whole time.
Hermione has always been a good student, but she's suspiciously good this term. She's in almost every class, showing up seemingly out of nowhere in her seat. Hermione's behavior is weird even by Hogwarts standards, and it makes Ron and Harry (and us!) wonder what she's up to. And if she keeps sneaking up on people like this she'll need to wear a bell.
Quote #5
RON: Hang on. That's not possible. Ancient Runes is in the same time as Divination. You have to be in two classes at once.
HERMIONE: Don't be silly. How could anyone be in two classes at once?
First of all, what magic is Ron using to actually be observant for once? And second, by the time Hermione says this, we're absolutely positive that she's in two classes at once, but we just don't know how she's doing it yet. We will eventually be introduced to a new magical artifact, the Time Turner.
Quote #6
HERMIONE: An Animagus is a wizard who elects to turn into an animal. A werewolf has no choice. With each full moon he no longer remembers who he is. He'd kill his best friend. Furthermore, the werewolf only responds to the call of its own kind.
Because werewolves don't actually exist (at least that's what they want you to think!) a work of fantasy needs to build its own lore about the creatures. Harry Potter's werewolf lore is fairly traditional, down to the full moon and the uncontrollable behavior.