Your "21 foot rule" does not apply in this situation.
There were two officers in the room, guns drawn, both facing the woman, one officer obviously with his finger on the trigger and pointed directly at the woman. The female officer had entered the room first, had a couple more seconds to evaluate the situation...and DID NOT FIRE HER DRAWN WEAPON.
He murdered the woman. Of course, the Blue Line will protect the murderer. He'll probably even get a commendation for saving the woman/child beater.
The video I saw clearly shows her hand extended.. and what appears to be a person standing next to her falling to the ground to the right as you watch..also with her hand extended. I replayed it several times and clearly she is next to someone that falls to the floor while her hand is extended…my 2 cents