The distance at what looks like the time of taser deployment would have been about 12 feet, well within taser range. And, he did move after he was on the ground.
It could have been a GSW to the spine, but from the video I am not seeing any evidence of a head or neck wound. Also, the officer to the left of Lavoy is behaving like he is using a taser, and not a pistol. (His right hand is at his hip during deployment of the taser, you can see him stripping wire from the taser as he maneuvers around Lavoy, and he wouldn’t have had a safe shot with a firearm).
We will get a better idea of what happened if/when the coroner’s report is released.
I still think that is more than 12 feet. The problem, among many, with taser is the vertical dart spread gets really wide past 10 feet. Coming up from behind is the best target, and less chance of hitting less desirable areas of the body. The thick clothing would also work against getting a solid circuit.