lighter and he was searching for his cigarettes. You just committed "aggravated assault with a deadly weapon" by backing up and hitting him if he lives. Self defense laws are very strict from state to state and stacked against you as a victim to prove you felt your life was in danger. Making statements like "Chances are he was living in government subsidized housing." can be used against you should the DA decide to prosecute you. The best choice is to get out of the situation fast if you feel threaten.