Chapter 13 - "Gryffindor versus Ravenclaw" - In which Ron and Hermione's anger grows, Quidditch practice resumes, Gryffindor plays Ravenclaw and wins despite Slytherin's attempts to sabotage the match by dressing as dementors. Gryffindor celebrates into the night while Hermione studies. Black gets into the dorm and apparently slashes Ron's bed curtains.
[Harry] arrives for his first anti-[dementor] lesson with [Lupin], and learns about the [Patronus Charm]. He attempts it on a [boggart], but hears his parents' last words with every attempt. As he leaves, he gives himself a pep talk - determined to succeed despite this meaning he wouldn't be able to hear his parents' voices again.
As time passes, [Oliver Wood] ups the number of weekly [Quidditch] practices to five, leaving [Harry] only one night a week for homework. However, [Hermione] is even more bogged down - and neither Harry nor [Ron] can figure out how she's getting to her classes.
[Oliver Wood] stops [Harry] to tell him that [McGonagall] won't return his [Firebolt], and that he'd better hurry up and buy another new broom instead.
As February arrives, [Harry] is constantly asking [McGonagall] for news of his [Firebolt], and struggling with his anti-[dementor] lessons, fighting his secret desire to hear his parents' voices.
At the end of [Harry]'s fourth anti-[dementor] lesson, [Lupin] reminds him that he's doing very well for being thirteen. They then sit drinking [butterbeer] together, talking about [Sirius Black] and the [dementor's kiss].
Lost in thought, [Harry] runs into [Professor McGonagall] - who, much to his surprise, returns his [Firebolt], good as ever.
[Harry] shows [Ron] his returned [Firebolt], and they return to the [common room], having decided to make up with [Hermione].
In the Common Room
Outside [Gryffindor Tower], [Harry] and [Ron] run into [Neville], who despite having written down the week's [passwords] has lost them. Finally [Sir Cadogan] lets them through, and Harry is immediately surrounded by fellow students admiring his [Firebolt].
[Harry] sits down to chat with [Hermione] about her course load, but they're interrupted when [Ron] suddenly bursts from the [dormitory], having discovered [Scabbers]'s blood amidst some cat hairs from [Crookshanks].