You're not very observant. McMichael is standing near the LEFT headlight as Arbery is jogging around the RIGHT side of the truck. Arbery accelerated toward McMichael as he got to the front of the truck and pushed McMichael from the left headlight area all the way to the left side of the road and even beyond (off camera). That makes Arbery the attacker.
The shotgun apparently wasn't even pointed at Arbery. If it had been, he would have fatally shot him the moment Arbery turned toward him. The first shot, fired near the left headlight area, only hit him in the hand, according to the autopsy report. Two more shots were fired as they struggle for the shotgun, one off camera.
Below is a link to the TMZ video. Go ahead, watch it again and point out to me where I'm mistaken.
https://www.tmz.com/2020/05/05/shooting-video-unarmed-black-man-killed-ahmaud-arbery-georgia-jogging/
Arbery was running around the truck, what happened out of view in front of the truck, we don’t know, but a shot was fired and Arbery runs away from his attacker, his attacker then chases Arbery and shoots again off camera and they come back on camera again and when Arbery was trying to take control of the murder weapon, he his shot a 3rd time, fatal.
Sorry, that is murder
I know you don’t like it cause it doesn’t fit the narrative you trying to sell, but it is what it is. It is up to a Jury at this point.
If you look at frame 0:09 you see Fake Cop Junior standing in the middle of the road to block Arbery’s path holding his shot gun
Arbery runs around the truck and Fake Cop Junior moves (0:15) towards the front of the truck to confront Arbery, Fake cop junior fires first shot at Arbery, Arbery and Fake Cop Junior wrestle and move off of camera, Shot 2 fired (0:30), both back on camera (0:31) third and fatal shot fired.
Sorry fake cop junior doesn’t chase Arbery between (0:16 and 0:20) that was my mistake