I can't go and shoot people in the back of the head because It's a kids' movie, which is actually quite a good test because you haven't got the overt threat of a knife in the face.
I couldn't get as big as a bodybuilder. I tried to put on as much weight in the right places as I could. My weightlifting was impressive for me, but not for some of the guys I see down at the gym.
I got to read some writings by serial killers, and they got inside my head. They were quite disturbing. I read disturbing stuff about that very detached way of manipulating people to do things.
I was grateful to have two weeks to shoot this one scene in Harry Potter. It's a big, big scene, but they have to deliver. And they have high expectations.
I was only interested in my scene, and I had to go through thousands and thousands of other scenes. I got my scene and I read it many, many, many, many, many times. That was my research.
In the studio system, things are expected of a film. By the first, second, third act, there's a generic language that comes out of the more commercial system.
