He did ask his buddy to shoot him right where he shot him, the sign language is clear on that point .
He pointed repeatedly to the spot on his head where he wanted that bullet to go. He was going to die, that explosion got him.
I suppect it took his tesitcals. Both legs were ruined as well, they would cut them off, a triple amputee, that would be hard to face.
All he would have left is his two upper arms.