PoA: Chapters 9 & 10

It's time for some more quidditch which means more ways the rules don't make sense. This time Malfoy doesn't have to play because he has a sore elbow. The dementors show up and Harry loses a quidditch (again rules?). Then Lupin is back and he agrees to teach Harry how to fight dementors. Fred and George bestow the Marauder's Map to Harry so he can stupidly sneak into Hogsmeade. Once there he learns that Sirius Black was his dad's best friend and also his godfather.