That is not funny, I had a friend that had that happen with a male recruit while he was a pit safety. He fell on the kid to prorect him and got shrapnel in his leg.
I am really amazed that they aren't wearing helmets and vests. Seems like a no brainer. Must not be the US. We had a lot of training with grenades and always wore protective attire. We even did advanced MOUT training where you would pull the pin and release the spoon. Then wait three seconds (American grenades have a 5 second fuse) then throw it into a concrete room. The idea was that the grenade would rattle around for two seconds then explode not allowing defenders to throw or kick it back out at you. I may have counted a little fast as I am fond of my hands and other body parts.
I never threw a practice grenade at the range. Carried them on maneuvers, but only threw live ones at the range,
But what do I know I was just Regular Army Infantry.