This is a gangster styled monologue where the character Pablo commits a murder. The actor needs to create the internal circumstances around the scene in order to play truthfully within the scene.
PABLO: (to C) The gun…go get my gun, please. (beat) (to Man in chair) When he gets back, I’m putting a bullet right into your forehead. There’s no talking. Just one bullet, one brain. It’s amazing how people like you accuse people like me of terrible things…but it’s the people like you who do the worst things. I wish killing you actually did something to that way of thinking, but it doesn’t. It won’t change. It will stay like this until something bigger happens.
(C hands gun to Pablo. Pablo fires one gun shot into the head of the man in chair.)