Yes, I saw the video. It cuts off of Ahmuad just as he's approaching the rear of the vehicle. McMichaels is standing at the driver door. When the video takes up again, McMichaels appears to have moved around the front of the pickup as Ahmaud is seen coming from the passenger side towards the front and then you see the scuffle. What you call attacking seems a little off. From what I read the video we see starts after an incident where the McMichaels had already tried to confront Arbery. This shows where they are cutting him off for the second time. It's obvious McMichaels wasn't merely standing still at the driver door. he had moved to intercept Arbery. Arbery seeing this likely makes a decision that these guys aren't giving up and he tries to take the gun away from McMichaels. Sounds more like self defense than attacking if what I described is accurate. If it's not, please provide the info and I will reevaluate
Video is shit and tough to make out. If you slow it down at 19-20 seconds in, you can clearly see the guy change directions in his run and charge directly at the other guy holding the gun who is standing on the drivers side of the vehicle still, gun down. A fight ensues and we lose them out of frame, when they come back in frame, the dead guy is holding the barrel of the gun, striking the guy holding the stock. He quickly lets go, staggers and dies.
You say it's obvious McMichaels wasn't standing at the drivers door, what do you base that on? The fact that he moved around to the front of the truck?
BTW, I'm in no way defending these guys, I feel like they were definitely looking for trouble, but I also don't think the dead guy was Mr Innocent out for a leisurely 20 miles jog.