I was trying to be protective, I didn't know it was Chris
You killed him!
Why did you shoot him?!
Evidence 1:The 14 year old boy says from comics are aliens or monsters.
The scene were paul shoots Chris because he thought he was a monster and serves the theme "fear and suspicion are destructive forces." Paul shot Chris and tries to back away. It happens at night and it takes place on a street called Maple Street. They were talking to see which answer is best after all the power went out. As a result, it becomes somewhat like the Purge.
Evidence 2:People see a dark figure and thinks its a monster, but they don't know it's Chris.
Evidence 3:Paul shoots the figure but it was Chris.