"During the preproduction when I'm shooting and then once we wrap we go away. And then the visual effects guys take over. And then they add all those little bits and pieces. They come up with ideas during the cut in the editing, and they said while would be really cool if we did this thing here where the blade pops out. So then you see the movie and say wow that's a really neat idea. I wish we would have thought of that."

Source : Source: collider.com

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