Surely to god you’d learn to throw a dummy grenade first? That technique was pathetic and she shouldn’t have been allowed anywhere near live one until she learned how to throw it properly.
I don’t think those are american troops.
Back in Basic we threw dummy grenades frequently. Object was to learn how to get a high arc and air burst rather than ground. I know times have changed but I can’t remember anyone having a problem with getting a grenade safely down range.