so if i have this right (and im sure im missing stuff, but this is what i put together):
Smith rear ends dude, drives away
probably drunk or buzzed (not condeming him for it, but that toxicology is gonna help the shooter)
dude follows him and catches up with him
they get outta the cars, start talking shyt, whatever
witness says Smith
says something along the lines of "i have a gun"
smith being shot in the back means he was clearly going to get it, or it was a reasonable assumption to make. breh didnt give him that, chance and shot first
all things considered, and being in the south with that gun mentality...sounds like a case of self defense to me