I've been following this thread with some interest and at times consternation. I think this story/event is actually 2 parts.
Part 1 consists of the initial encounter (RAS?), what the officer was reaching for if his hand was in the window, why she rolled up the window, whether or not the LEOs arm was caught which leads to was he dragged or not and was he justified in the first shot.
Part 2 consists of why he continued firing at a middle age women, already wounded (which he may or may not have known) endangering her, innocents in the area form an errant shot and the stopping of someone who was apparently unarmed instead of holstering his weapon and goinng back to his car and stopping her otherwise.
Even if we make a for the sake of argument allowance that his arm was, however stupidly, caught in the window as she started to drive away and his first shot shattered the window freeing him, I fail to see how the following 5, 6, 7 shots, whatever the count, were reasonable. It sounds like an adrenaline dump that regardless of the first shot, led to a massive, deadly, to her and bystanders, if any, over reaction following his stopping the threat.
In other words, even IF the first shot was justified to stop an imminent threat to great bodily injury or death (shooting out the window), every shot afterwards appears to be excessive force and shooting to kill. It is difficult to draw conclusions without reporting of the antecedents to the stop and the officers full version of teh stop itself, ie what happened between his approaching her and his drawing his sidearm. Hopefully, after the investigation, this will become available one way or the other.