Strawman, since he was at home, Nikki Black could have just yelled out of one of his windows: “Hey, not this again. Like I’ve said previously, move your car outta my parking spot”
How do you know the neighbor hadn't already told Shane that on prior occasions and was just ignored.
Yep there are many different things that could have happened
It was Shane's friend who parked in the neighbors spot (apparently to unload so stuff) and Shane was parked in his own spot
Shane could have parked on the street and told his friend to park in his spot
Shane could have called his neighbor and asked for permission to park in his spot for a few minutes.
Why didn't Shane just apologize and say they would move the truck right away?
Shane fucked up and no matter what happens to his neighbor in terms of legal consequences Shane is the one is who has a bullet in his gut and will have to live with the long term health consequences of getting shot.