Leo immediately fired off a Disarming Charm, which Marisa dodged. She fired back her trademark Tickling Charm which hit Leo and left him giggling on the ground but still tightly gripping his wand.

"Do you give in?" asked Marisa, smirking.

"No," said Leo between giggles. "Definitely not."

Marisa sighed and kept going. Leo refused to launch a spell at Marisa.

This stalemate continued for nearly a minute before Marisa dispelled the Tickling Charm and fired a Full Body-Bind.

Unlike last time, however, Leo managed to roll underneath and regain his footing. He waited, wand in hand, for Marisa's next move.

"Petrificus Totalus! Petrificus Totalus! Petrificus Totalus!"

Three Full Body-Binds. One fired directly at Leo, and one to either side. Impossible to dodge all three at once unless you could fly.

Leo couldn't fly. But he did have one last trick up his sleeve. "Protego!"

The bubble-like shield appeared, wobbling, in thin air just before Marisa's spell smashed into it. Leo stayed perfectly still as the other two curses sailed harmlessly past. The shield wobbled uncontrollably, but – just about – held.

Leo shot Marisa a smug look, then decided that it was time to go on the offensive.

"Melofors! Expelliarmus! Petrificus Totalus!" he cast, quickly dispelling his shield. The first jinx hit her, but she rolled out of the way of the other two. A chorus of laughs broke out from the crowd as they saw Marisa lying on the ground, pumpkin encasing her head.

She struggled to her feet and decided to pull out one of her own trickier spells. "Locomotor pumpkin!"

The pumpkin, controlled by her Locomotion Charm, lifted up off Marisa's head and floated towards Leo, who turned and ran.

What followed was a game of cat-and-mouse which had most of the students gasping with laughter as if they'd been hit by one of Marisa's Tickling Charms.

Leo could run a lot faster than Marisa could make her pumpkin fly, but he was prevented by the students surrounding the duelling area from escaping altogether and so had to dodge and twist. Eventually he lost patience and flicked his wand at the pumpkin. "Depulso!" His Banishing Charm was stronger than Marisa's Locomotion Charm and so the pumpkin flew towards her.

She ducked and covered her head, having no wish to get it covered in pumpkin again, but remained alert and prepared to dodge – until she heard a familiar drawl.

"Asriel duelling the Mudblood? Finally seen sense, have you, Leo?"

Furious, Marisa instantly twisted her wand to point at Draco and screamed: "Slugulus Erecto!"

Draco doubled over, clutching his chest, and threw up three large slugs.

"I told you before," said Marisa coldly, "don't call me a Mudblood."

Then Leo's Full Body-Bind hit her in the chest.