Meanwhile, Harry needed help again. Apparently some dementors had got away from Azkaban, turned up in Harry's Muggle neighbourhood in Surrey, and gone after his awful cousin---and Harry, being Thick As An Asphalt Sandwich, drove them off with a Patronus charm. To think that he'd do that after the way his worthless relatives treated him! Had it been me, I'd have been quietly chanting "Go, Dementors, go!" Of course, it was a trap, and until Dumbledore and Arthur Weasley swung into action, it looked bad for Harry. Even after they did, he had to face trial in front of the entire Wizengamot. If it had gone badly, he'd have been expelled.