The co worker who gave him the gun and after killing him the little person is freaking out after witnessing it did you think he was also going to kill him as well. In the scene he says he can leave. He runs for the door but can’t reach the lock. I didn’t know if Arthur did that on purpose or not. When Arthur walks up to unlock the door I was hoping he wouldn’t do anything to him. He unlocks it then lets him go. It is a tense scene.
That was INTENSE! My theater broke out in extremely nervous laughter when he couldn’t reach the lock. Not the kind of laugh that suggested anyone thought it was truly funny, but the panicky kind of chuckle/snort of a room of people feeling very on edge.