I read this story a few days ago as well.
I had read it again somewhere this morning and mentioned to my husband that I bet the young guy’s friends will want him to teach them how to use the “flip” as well. A marble and a piece of gravel were good handy projectiles to use and he has obviously practiced enough to have great aim.
I’m gonna go find me a Wrist Rocket like I had as a kid. Marbles, ball-bearings, rocks, bb’s, lead fishing weights,.........