I think there are some gaps in your analysis that I discussed above. Based on the video, I do not believe that the office on the left was a shooter.
Also, unless his bullet severed Lavoy’s spine, or unless he shot a cannon of a gun (in which case he has a left forearm to rival Popeye), Lavoy’s body drop is consistent with being tased.
To clarify my statement, I think Lavoy was already mortally wounded and the officer on the left put him on the ground with a taser.
I thought he got hit in the head