I should add that the kid was definitely at fault because when the officer yelled STOP, he didn’t STOP. When the police tell you to STOP, you STOP.
No, you shouldn't add that. A 12-year-old kid playing in the apartment complex parking lot where he is spending the night with his cousin can't be expected to react appropriately when he is suddenly confronted with two yelling cops - at least one of whom is pointing a gun at him.