You really have to act on the force, too. You're involved in a hundred things a day, and you have to react in a hundred different ways, depending on what's going on. And you learn that as you go through your career, how you handle certain situations, interrogations, how you carry yourself. There's a kind of acting to it.
You can't act for the editing. You have to leave that to him. So you just go in and do the scene the way you think is right or whatever you're directed to do, and leave the rest of that technical stuff up to the director.