Chapter 10 - "The Rogue Bludger" - In which a note from Lockhart gets HRH into the Restricted Section of the library and a book on making Polyjuice Potion. At the Quidditch match a rogue Bludger chases Harry, breaking his arm but not stopping him from getting the Snitch. Lockhart's attempt to heal Harry removes the bones from his arm. Madam Pomfrey begins to heal him, Dobby pays a visit, and Colin Creevey is Petrified.
The Trio Investigates
[Harry], [Hermione], and [Ron] explore the hallway where [Mrs. Norris] was attacked, noticing a large number of [spiders] and going into the girls bathroom to ask [Moaning Myrtle] if she saw anything.
[Percy] spies [Ron] leaving [Moaning Myrtle]'s bathroom and confronts him, implying that his antics hurt [Ginny]; [Ron] responds by pointing out that [Percy]'s more frightened of losing his chance to be [Head Boy].
The trio begins to wonder whether [Malfoy] might be the heir of [Slytherin], and at [Hermione]'s suggestion, they plot to brew [Polyjuice Potion] to find out, once they can get into the [Restricted Section] of the [library].
During one of [Lockhart]'s typically useless [Defence Against the Dark Arts] classes, [Harry] enthusiastically plays a [werewolf] form one of [Lockhart]'s books to butter him up, so that he'll give [Hermione] a pass to the [Restricted Section] of the [library].
After class, [Hermione] asks [Professor Lockhart] for a pass to the [library]'s [Restricted Section], which he signs off on without a glance.
[Hermione] leads [Harry] and [Ron] to the [library], where thanks to [Lockhart]'s note they get a book with the formula for [Polyjuice Potion]. [Madam Pince], however, won't let [Hermione] keep the signed note.
Sitting in [Moaning Myrtle]'s bathroom, [Hermione] plots the things she, [Ron], and [Harry] will need to do to successfully brew [Polyjuice Potion] - including, they realize, breaking into [Snape]'s private stores.
Gryffindor vs. Slytherin
[Harry] wakes up early and heads to breakfast, eating with the [Gryffindor team] before they all walk down to the [locker room] together for [Oliver Wood]'s pregame speech.
The big [Slytherin]-[Gryffindor] [Quidditch] match begins, but [Harry] is soon surprised when a [Bludger] seems to be programmed just to go after him. After a quick timeout, he tells his teammates to leave him and the [Bludger] alone, and before long it breaks his arm. [Harry], though, quickly speeds toward [Malfoy], who doesn\\\'t realize the [Snitch] is right next to him, and catches it to win the match.