I shot Carbon Express arrows, but I've always loved Gold Tips because they actually put a little decal on all their shafts that says "Flex First" with little diagram of two hands flexing an arrow. It's great advice and something I do on a regular basis. So much in fact that I don't even think about it anymore, it's just naturally what happens when I pull the arrow from the target and go to put it in my quiver. You can hear the sound of it crinkle, like wadding up a piece of paper when there is a small crack or splinter in the arrow. If you flex it and it makes noise, throw it away immediately. Arrows are expensive, but I think what this poor kid went through and the medical costs involved, buying new ones would have been worth it.
Hope he makes a quick recovery. Just remember, FLEX FIRST!!