It looks like he fell backwards, implying the car hit him, but the bodycam actually detached. Until another bodycam shows why it fell, the car either clipped his vest or he pulled it off while drawing his gun…
To me this video confirms that the story from the administration that he was run over and hospitalised is nonsense.
It also confirms that the couple were being confrontational and obstructionist, but I still don’t think that’s a reason for her to die.
A rational organisation would reflect and ask how this sort of scenario can be handled better in future, but that doesn’t seem likely here.