I am pro cop too, but wow, pulling the gun was wrong. At least it looks like he took out the legs and not center of mass.
That retarded girl juggling the bat and the pick simply was zero threat, except to herself. Oh well, can't expect perfect armchair QB conditions when you're job is keeping the peace amongst the underbelly.

They tried less lethal when they tazed her, and she chose to charge at them. The cops had every right to shoot if tazing didn't work.