1) don’t chase the guy with the AR15 who is running away.
2) don’t throw anything at the guy with the AR15, especially if it is just a plastic bag that looks like a burning Molotov cocktail.
3) don’t beat the guy with the AR15 with a skateboard. At least get a stick or something.
4) don’t fool the guy with the AR15 that you just want to help him and then pull out your handgun when you think he won’t notice.