No rounds entered the kid’s back.
Except for the last one that entered his buttocks as he was on the ground and went up into his spine -- meaning that he was shot while laying helpless dying on the ground.
All the rest hit the right chest, right hip, right hand, right arm, right side of left arm -- meaning that Gelhaus's decision to shoot took place when the kid's back was turned as he was in the process of turning around.