I think the financial restraint really pushes me as a director to be more creative with the way I shoot the film.

Not many people realize this, but I'm a really squeamish guy. When I watch other horror films that are really over-the-top with their blood and guts, I cannot watch it. So if my threshold to something onscreen is at that level, you can imagine how my threshold is to all the pain and suffering that is happening in the real world.

For me, the sound design and the musical score is a big part of what makes scary movies work.

When you work with an actor and then you discover new things that are better, I think you gotta be free to be able to go with the new things that you're finding. I think that's very important. I have a strong idea when I go to shoot a movie but I also love to discover things when I'm on set as well.

I realized that my camera work could help me in a lot of ways to put the audience in the driver's seat, so to speak, to get them in there with the action, and to get them as close and be as intimate with what was going on on-screen as possible.

One of the things I tried to do is to kind of talk my actors through the scene, but at the same time let them know how I plan to shoot the film and just give them an insight into the way I'm thinking, so that when they're acting out their scene, they can kind of see it in their minds' eyes.

When you're watching an action movie, you experience an action movie more outside of the aquarium, you're out of the aquarium looking in at all the swimming fish that are in there. Whereas horror films and thrillers are designed to put the audience into that box, into that aquarium.