I found Jumpy on YouTube. I wrote a movie about a guy with a dog and was like, "What have I done? This is going to be a nightmare. We're a small movie and we're never going to be able to do this."

The hardest animal was the vulture. But the horses were great, the dog was great [in Valley of Violence]. It was really easy.

I did the movie [Valley of Violence] from two perspectives. You're with Ethan [Hawke] the whole movie, but for the first half, you're really with Ethan. For the second half, you're with him, but also you're with the bad guys because he kind of becomes the bad guy. No one's really good in the movie.

It's one of those things, when you look back on it, you'd go, "Oh, I could've done without that. If I could go back in time, I would do it different." That's the thing with violence in general.

They're both [Ethan Hawke and John Travolta] so good. It's hard to explain. But they're consummate professionals and you see the little choices they make - you see it in their eye. You see these little details they do where you go, "That's why they're them."

That's what's interesting about people. It can be funny, but when [John] Travolta got there and did [comic moments] you're like, "Oh! This is really funny." Or when Karen [Gillan] and Taissa [Farmiga] do something, I'm like, "This came out so much funnier."

I'd been all hyped about it, I was like, "Please come," and to have that and know Tommy Nohilly is probably going like, "This is cool," it makes me feel good.