On the way back into the castle, [Harry] confronts [Hermione], who admits to having [Confunded] [Cormac McLaggen] during [Quidditch] tryouts so [Ron] would beat him.
Helping Hagrid Feel Better
[Harry], [Ron], and [Hermione] pet [Buckbeak] until [Hagrid] arrives - and promptly runs away into his [hut], slamming the door behind him.
[Hagrid] tears his door open angrily and, after a brief confrontation with [Harry], invites the trio in.
Sitting in [Hagrid's hut], the trio discusses [Care of Magical Creatures] with [Hagrid], who admits he's also partially upset because [Aragog] is close to death. After [Hermione] offers to help and they all assure [Hagrid] that he's a good teacher, they depart, leaving him more cheerful.
[Professor Slughorn] spots [Harry] and personally invites him to a [Slug Club] party, but [Harry] refuses, much to [Hermione]'s dismay, because he has to serve his [detention] with [Snape].
Sitting at dinner, [Hermione] reads that [Arthur Weasley] has raided the [Malfoy mansion], [Harry] tries again to sell his theory that [Malfoy] is a [Death Eater], and [Demelza Robins] arrives to tell [Harry] that [Snape] won't let him out of his [detention].
Chapter 12 - "Silver and Opals" - In which Harry tries one of the Half-Blood Prince's spells while reading in bed and levitates Ron by accident, argues with Hermione over the danger of the Prince, and gets word of his next lesson with Dumbledore. The trio then walks to Hogsmeade, where Slughorn corners Harry in Honeydukes and Harry sees Mundungus with things stolen from Grimmauld Place. On the way home, an Imperiused Katie Bell touches a cursed necklace and is hurt; Harry then suspects Draco and tells McGonagall this, though Ron and Hermione don't believe him.
Unable to figure out why [Dumbledore] has been disappearing so much, [Harry] feels slightly abandoned that his lessons haven't continued.
[Harry] awakes early and decides to read the [Half-Blood Prince]'s [Potions] book. He tries the [Levicorpus] spell and accidentally lifts [Ron] into the air.
Sitting at breakfast, [Ron] relives the [Levicorpus] incident to an angry [Hermione], and [Ginny] delivers [Harry] news of [Dumbledore]'s next lesson.