These stories you can pretty much figure out what happened.
There is no way the citizen was given warning and enough time to react. He wouldn’t have deliberately ignored a call to drop the gun. Cop runs to the scene and start blasting away.
In this situation, kick the bad guys gun away gun and stick the your own gun,on your gun in your belt or pocket, out if sight by available if you need it. Don’t let the cops rushing to the scene see a gun in your hand.
I imagine you’re right and if the bodycam and dashcam video haven’t been accidentally/conveniently deleted then they’ll prove you right.