What an idiot. They were using live Grenades for training in 1959 when I went though basic. Simple, you pull the pin, throw the damn thing as far as you can and lie down while it is still in the air. Grenade goes boom, has a very small kill radius and you stand up and walk away. Nice to be cautious but this is a grenade we are talking about not a 155 howitzer round that failed to explode.
Perhaps they should just call you next time.........