The deputy on the right side of the patrol car (and first in the line of fire) would have been in the best position to see the gun barrel as the teen turned around, while the deputy on the left side of the car was at a more acute angle.
Likewise, had there been an orange safety tip on the barrel of the gun the teen was holding, the officer on the right would have been in the best position to see it as the teen turned.
You can't be serious. How do you bring an AK47 in front of you if it's in your left hand and your right side is turning toward the front???
That pellet gun was never in a position to be a threat.
In order for it to have been a threat he would have to be facing the police with both hands on the gun but he was shot in the right side with the gun in his left.