That “child” was not defending itself. It was on the attack. I don’t know the circumstances, but a look at the video shows the girl on the attack.
It was one of those circumstances where the patrolman should have pulled up....stepped out....fired three shots in the air to get everyone’s attention and then demanded everyone to lay on the ground until ‘peace’ had been restored.
Iirc, she got up from the ground to go after the black in pink