The actor shouldn't edit themselves or be anxious. And the actors that I admire are always the ones who are inventive and their imaginative life in free-willing. It's a director's job to go, "No here, don't do that, go there."

I'm interested in the spirits of people. In the theatre, there's the acting part of acting - and I'm not saying that can't be great - and there's the essence. To explore that essence, you need a key, a look, a gesture, an insight that unlocks the person's soul.

There's a challenge to playing these fantasy figures because they are fantasy figures. You have to enter into this sort of imaginative world of the writer.

It [the scene] can be something given to you and you go, "Ah this is a good idea, I can work with this." Sometimes it cuts right across your instinct and that's when I might resist. Even if the director might be insistent, I think it's very important to say, "Look, I'm not feeling this. I'll try to make it work but I got to let you know."

People fear they won’t get what they want.

He's really sort of the devil. He's completely emotionally detached. He has no empathy. You find that in psychopaths. It's about power with Voldemort. It's an aphrodisiac for him. Power makes him feel alive.

The film depends on the audience's belief in this relationship.