"Masur: During rehearsal, [Keith David] and I started talking about how our characters felt about each other. That’s how we [knew we didn't like each other.] Like in the scene where Childs pulls a gun on my character and I pull a knife on him. Mind you: In California, it was really hard to get a knife that would flip open. I wanted it to be a buck knife, so I got one at a survivalist store. And while I was there, I also got a little attachment so you could flick the knife open with your thumb. I oiled the hell out of that knife and cut my hand several times."