"Well done, Harry!" said Percy, looking delighted. "Ten Galleons to me! Must find Penelope, excuse me --" 

"Good for you, Harry!" roared Seamus Finnigan.

 "Ruddy brilliant!" boomed Hagrid over the heads of the milling Gryffindors.

 "That was quite some Patronus," said a voice in Harry's ear. 

Harry turned around to see Professor Lupin, who looked both shaken and pleased.

 "The dementors didn't affect me at all!" Harry said excitedly. "I didn't feel a thing!" 

"That would be because they -- er -- weren't dementors," said Professor Lupin. "Come and see -- " 

He led Harry out of the crowd until they were able to see the edge of the field. "You gave Mr. Malfoy quite a fright," said Lupin. Harry stared. Lying in a crumpled heap on the ground were Malfoy, Crabbe, Goyle, and Marcus Flint, the Slytherin team Captain, all struggling to remove themselves from long, black, hooded robes. It looked as though Malfoy had been standing on Goyle's shoulders. Sitting near Malfoy, licking its paws, was a wolf Patronus, whose owner stood nearby, grinning smugly. Standing over them, with an expression of the utmost fury on her face, was Professor McGonagall. 

"An unworthy trick!" she was shouting. "A low and cowardly attempt to sabotage the Gryffindor Seeker! Detention for all of you, and fifty points from Slytherin! I shall be speaking to Professor Dumbledore about this, make no mistake! Ah, here he comes now!"

 If anything could have set the seal on Gryffindor's victory, it was this. Ron, who had fought his way through to Harry's side, doubled up with laughter as they watched Malfoy fighting to extricate himself from the robe, Goyle's head still stuck inside it.