This makes this way better. Here is what any normal person would do. Hassle turns up and goes "where is the gun, open fire, open fire", you keep the door closed, get your phone and call 911 - there is a man knocking on my door, asking me to shoot him, please send someone to send him away. Police come, Frank fucks off, go on with day. Alternatively, get the gun, keep it near you and then go on with your day inside your house, watch some tv, play a computer game and so on. If Hassle can't get a reaction, he will fuck off, maybe take a few pictures to show how much he owned you and then leave.
Instead he rises to the provocations like the manchild he is and pulls out the gun and fires a warning shot. I can't blame his alleged bad upbringing for this lack of critical thinking skills because he's 40 to 50 years old. What a complete specimen.