It’s always a physical thing, I think. You know, I love the challenge of a very complicated psychological scene, or a very emotional scene. I never find that difficult. It’s usually a physical challenge and on this one there was a day when we were shooting flashbacks to Chechnya in the late nineties and we were shooting close to the border of Poland. It was minus fourteen outside. We arrived at four in-the-morning and I was desperate for the bathroom, and all of the toilets were frozen. So, I had to go around the back of a shed, which was…you know, pee, in the snow, in minus fourteen, which was a little bit uncomfortable.