So RULE NO 1, as a Suicide Bomb Trainer, we would think, is DO NOT USE LIVE AMMUNITION so DO NOT practice with LIVE ammunition.
But this was not the case for a Suicide Bomb Trainer in Baghdad, Iraq who blew up 21 of his students and himself. They were part of the terror group known as the Islamic State of Iraq and Syria and responsible for a string of attacks. So in this case it’s better to view it as lives saved and not lost due to this event.
According to recent reports, it was rumored that the instructor was in the process of showing his students how to use a suicide belt. As he was teaching, the live suicide belt actually detonated, resulting in blowing up the entire class and himself.