Harry, Ron, and Hermione sit in the common room, each thinking about recent developments in relationships. Katie Bell then returns, but can't remember the details of her [Imperius Curse], and the trio thinks very briefly of brewing more [Felix Felicis].

The [Gryffindor Quidditch Team] has a great practice thanks to Katie's return and Ginny's impersonations of Ron.

As time passes, Harry continues thinking about Ginny and wondering whether Ron would be upset if they got together. Meanwhile, the whole school is focusing on the final [Quidditch] match of the year, which will determine the winner of the [Quidditch Cup], and Harry is still thinking about what Malfoy is up to and how to stop him.

Harry spots Malfoy in the bathroom with Moaning Myrtle, and immediately Draco springs up to curse Harry; Harry then uses the [Sectumsempra] curse, springing gashes in Malfoy. Myrtle then freaks out and goes screaming to the whole school.

Snape rushes into the bathroom, quickly healing the gashes Harry has made in Malfoy. He sends Harry to get his textbooks, and when Harry returns, gives him detention every Saturday for the rest of the school year.

Harry runs and quickly borrows Ron's [Advanced Potion-Making] and hides his own in the Room of Requirement before returning to show his books to Snape.

With the [Quidditch] match approaching, Gryffindors are all quite frustrated with Harry for landing himself in detention with Snape.