Of all the videos I've seen of this so far there is nothing to indicate he was there to support Black Lives Matter.
He is a "Blue Lives Matter" supporter, there are pics of him with that. He was there to guard the business.
The first guy that got shot in the head was chasing the kid down in the parking lot, which is when the first shooting happened. That's the guy in red shirt that got shot in the head.
The kid immediately called someone (presumably police) saying he just killed someone.
As mob started gathering around the wounded man, kid walks away, mob chases him down, kid falls to ground, multiple people jump on him, one kicking him, one hitting with skateboard. Kid shoots skateboard guy in chest.
A third guy pulls a handgun (there are still pics clearly depicting this man pointing handgun right at the kid) - kid shoots him in the arm, that's the guy that got half his arm blown off. Kid then walks away, towards police.
Arms in air multiple times, walks right up to police vehicles with arms in air.
No idea where this "fleeing fugitive" crap comes from because he surrendered immediately.