-Support
In this and any other situation that involves a firearm, regardless of the side that is brandishing one (gov or crim), you should only resort to violence or shooting each other only to resolve an ultimatum. You especially being the police officer here, should follow this standard to the fullest, and should to the very best of your ability try to deescalate the situation.
As for the warn, I do not feel as if there is enough evidence to properly support the statement that it is a false one, which I feel that providing video or some other kind of visual evidence of the situation in question would yield a better understanding of your side of this. For the future if you don't have any right now, I recommend setting up Xbox game bar, which is built into Window's and would allow you to record or clip moments by pressing specific key binds.