You're all very quick to attack, maybe just because it's raaaid.
I used to play very high-level competitive tournament paintball, and obviously there is a loader above the gun that holds about 160 balls and has a vertical feed tube, so no sights whatsoever. I figured this technique out on my own, and found it to be incredibly accurate, as far as paintball guns go. A painball gun is no where near as accurate as a real gun, or even a bb gun, but this way of shooting where you aim at the target, position your head behind the gun so that you can essentially see two barrels perfectly symmetrical, is by far the most accurate way of shooting a paintball gun. I always tried explaining the technique to many teammates over the years and most of them couldn't even figure out what it was I was telling them to try.
Anyway, don't be so quick to let him know he's a nutcase or whatever, there's nothing written in stone that prevents someone from possibly using this technique with a real firearm with extremely proficient success... at shortish-range
