You have to respect the proprieties. They laid down a non-lethal barrage to provoke him into returning fire, which would justify killing him, unfortunatly he was unarmed, so all they could do was arrest him.
The best laid plans and all that.
“They laid down a non-lethal barrage to provoke him into returning fire”
Nah, the only reason it was non-lethal was because the kid was lucky enough to hide behind the engine block.