You've got to get obsessed and stay obsessed

I'd seen that on youtube but didn't know where it came from - I thought maybe Tom just did it on a lark! I agree that it would've been a bit too different from the book - but I do think the movie cheated Draco of a scene that showed his best side. In the book, when Crabbe starts the Fiendfyre, Goyle is Stupefied from Hermione's spell and while Harry and the others are grabbing brooms, Draco is dragging Goyle - and he doesn't let go of him even to get on Harry's broom until Ron and Hermione come to get Goyle. He risked his life for his friend. They left that out of the movie.