You try to make them comfortable so they can do what they're best at, and make them shine. You always want to make an actor shine. I'm of the mind that there's no one - you, your mother, anyone, that if in the right place at the right time in the right context, couldn't shine in a movie. And so if it means, "Oh, I have to make them uncomfortable," then whatever it takes to get what I need up onscreen. It's all in the service of the story.