I was shooting all this time. And there was only one guy who helped to pull him. And I had to think whether I was going to keep shooting or help the guy. And so I kept shooting and then they put him in this little clinic, and I photographed through the window while they had to amputate his leg. And I felt very strange because I didn't - I felt I could have helped, but I didn't help. But then I also felt elated that I was getting a shot that would be important to the film.

I think that the whole voyeuristic attitude of filmmakers or of me personally - of shooting documentaries and so forth - is an important issue. And it was an important issue to me, personally. And the whole question of when - when do you put the camera down or when do you keep shooting to get the shot. And a number of times in my life I've had that question hit me very hard.

Well, there is a contradiction in a sense. If you're making commercials which sell products which are unhealthy or which are unnecessary, I think that you are part of a system - I am part of a system which encourages people to buy things and do things which are not to their best interest. And to that extent you could say it was contradictory.

From my image of digging around in the mud like a grunt, I preferred fighting the war from ships.

The helicopter was a U.S. Navy helicopter. There were no civilian helicopters available to film companies, so they just made some stuff out of two-by-four wood. And I would straddle a two-by-four out from the helicopter with a camera and what we call a high hat, which is a low metal stand.

When you hear the word tear gas you think, well, your eyes will burn and that's it. But that whole feeling of your whole skin burning, that you can't breathe, you can't inhale, you feel suffocated - it's a very, very terrifying experience.

When I search myself carefully I do think it's from my mother. I even feel strange saying that. Most people, I believe, when they're asked profound questions about their own persona are not really able to enunciate it, because it's a combination of so many things. But certainly influences early on that I felt from my mother. I wouldn't say she was "political" per se; she was sensitive to other people.