When you stand at your third-story window, high above the belligerent nincompoop yelling and stomping your car, you are probably well short of the standard that justifies shooting. This is one of the cases where calling the cops seems more reasonable. You can always keep the 10-22 handy in case the idiot follows through on his threat to kick in your door.
The accused claims he shot to scare, usually a bad idea, and didn't mean to hit the deceased in the chest. So maybe it's also an opportunity to sketch for your student the path of a bullet flying at much of an angle from