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In the latest issue of Empire, director David Yates remarked that the sixth franchise entry will offer "sex, drugs and rock 'n' roll".
Responding to his director's comments, Radcliffe said: "There's obviously no sex in the book, it's all subtext, but there is a fair amount of sexual energy and there are some drug parallels.
"We have a couple of what David calls our 'Trainspotting moments'. That's two films I never thought would be mentioned in the same breath... There's a great balance. The light parts are lighter than before and the dark parts are extremely dark."
Yates confirmed that he intends to start the movie with a huge action sequence.
"We're opening with a big attack," he said. "Jo [Rowling] talks about it in the book, but we're going to show it. We'll bring a major London landmark crashing down. It should be quite spectacular."
Harry Potter And The Half Blood Prince is scheduled for release on November 21.
