I played the video 5 times
https://www.liveleak.com/view?t=9HlLa_1588700357
First shot heard, they were out of view because the truck was in the way.
Second shot, they were off to the left
Third shot was the fatal shot and Arbery falls to the ground and his murderer walks away
you witnessed a murder
You left out the part about the Flunky X DA investigator leaving the pick up bed & running towards the victim and stopping.
Not with a 1st aid kit or anything to assist someone his kid just murdered but a hand gun.
“...and his murderer walks away”
That was really odd how the shooter just turned around and walked away before the threat was even on the ground.