Luckily it wasn't that bad of a high-side. Number of factors going on. He kept hold of the bars which kept him near the bike, luckily it landed back on the front tire still pointed straight down the track. All of his weight was over the front axle which kept the rear tire from getting too much grip. Rear tire fell in line with the front and he pushed his weight back to the center of the bike. He hit his bum on the seat pushing his body to the right side of the bike and put his weight on his left elbow and left rib cage which was on top of the tank.