"As I aimed at his tire ... I just decided not to go ahead and fire at the tire. I thought 'what if I missed' ... I thought this probably isn't the right thing to do, so I lowered the gun, and my finger still pulled on the trigger more out of frustration than anything."Gee whiz, you think it's not the right thing to do. I understand that he's become physically menacing with you prior. However this time, he was not. This time you decided to back up your anger with a firearm.
Remember folks, you are responsible for the administration and function of your firearms.