He is 23. We were there to take his girl friend on her first shooting experience. She was in the lane next to the guy. I was a couple of lanes over, and my son was right behind the guy's lane (coming to switch places with me, I think) when it happened. Fortunately, there weren't many kids around. I think there was one boy who was probably about 14 waiting just outside.
I hope that didn't ruin your son's girlfriend on shooting. That had to be a pretty traumatic first range trip.