[[Muggles' Guide to Harry Potter/Characters/Draco_MalfoyDraco Malfoy|Draco Malfoy]] reappears on Thursday, midway through [[Muggles' Guide to Harry Potter/Characters/Severus_SnapeSeverus Snape|Professor Snape]]'s Double [[Muggles' Guide to Harry Potter/Magic/Potions|Potions]] class, claiming his injury is still painful. He sits himself at [[Muggles' Guide to Harry Potter/Characters/Harry_PotterHarry Potter|Harry]] and [[Muggles' Guide to Harry Potter/Characters/Ron_WeasleyRon Weasley|Ron's]] bench, and Snape orders them to prepare Malfoy's ingredients for him. Malfoy taunts them with threats of [[Muggles' Guide to Harry Potter/Characters/Rubeus_HagridRubeus Hagrid|Hagrid's]] imminent dismissal thanks to his father, [[Muggles' Guide to Harry Potter/Characters/Lucius_MalfoyLucius Malfoy|Lucius]], who apparently still has influence with the Ministry. Malfoy also contends that if he was Harry, he would want revenge on [[Muggles' Guide to Harry Potter/Characters/Sirius_BlackSirius Black|Sirius Black]]. Harry later asks Ron why he would want revenge against Black; Ron cannot answer. Meanwhile, [[Muggles' Guide to Harry Potter/Characters/Hermione_GrangerHermione Granger|Hermione]] helps [[Muggles' Guide to Harry Potter/Characters/Neville_LongbottomNeville Longbottom|Neville]] make his potion correctly, against Snape's orders; Snape penalizes Gryffindor five House points, because he assumes (correctly) that Hermione helped him.
As the Trio leave the dungeon, Hermione suddenly seems to disappear. Looking around, Ron sees her catching up while tucking something down her robe. Her bag splits, and Ron asks why she is carrying so many books, as there is nothing that afternoon except [[Muggles' Guide to Harry Potter/Magic/Defence Against the Dark Arts|Defence Against the Dark Arts]]. She does not answer.
In DefenseDefence Against the Dark Arts, [[Muggles' Guide to Harry Potter/Characters/Remus_LupinRemus Lupin|Professor Lupin]] tells the class to put their books away and bring out their wands. This will be a practical class. He leads them to the staff room, just as Snape is leaving. When Snape snidely comments about Neville's undisciplined magic, Lupin replies that he hoped Neville would lead off the demonstration. Lupin explains that there is a [[Muggles' Guide to Harry Potter/Magic/Boggart|Boggart]] in the wardrobe. No one knows what a Boggart looks like because it styles itself after a person's deepest fear. To repel it, it must be forced to change into a humorous shape by casting the [[Muggles' Guide to Harry Potter/Magic/Riddikulus|''Riddikulus'' charm]]. Neville's greatest fear is Snape. Lupin tells Neville to imagine the scary professor wearing his grandmother's clothing. Each student similarly comes up with their own fear and then pictures it as a funny image. Harry's greatest fear is a [[Muggles' Guide to Harry Potter/Magic/Dementor|Dementor]], and he wonders how can he make that funny. The wardrobe is opened and "Snape" emerges. Neville casts the spell that dresses Snape as his grandmother. Each takes a shot at the Boggart. As Harry goes to take his turn, Lupin steps in before the Bogart takes shape. It rapidly turns into a floating white orb, and Lupin forces it back to Neville, who spells it one last time, whereupon it vanishes. Class is dismissed. Harry wonders why he was prevented from repelling the Boggart while [[Muggles' Guide to Harry Potter/Characters/Parvati_PatilParvati Patil|Parvati]] is curious as to why Lupin fears crystal balls. Ron wants to know what Hermione's worst fear is, but she also did not have a chance at the Boggart.
