Your grandson has an excellent sense of ma-ai that really shows when he avoids the takedown attempt. He cleanly turned Peters' charge to his own advantage, but Peters had some effective ground defense.
I've certainly seen kicks go really badly for a fighter, and I hope your guys dont rely upon them too much. Jay was smart to come out swinging even if it was with his feet after the warning since Peters was probably expecting another humping. But the margin of error for kicks is much wider than the margin for success.....
https://www.youtube.com/watch?v=Ex36w5Sn2QE
I was a roamer for this event. It was at a horse arena in Corvallis. At the start of the fight, the guy's trainers were hollering for him to stop kicking so much, and he didn't listen. We all heard that awful sound. Then we had to spend a good half hour trying to maintain a path for the docs and the EMTs. Folks had to get closer so their phones could get a better picture. Fuckers.