Indeed, rather useless as low-levels would still die unless the guards have BB guns which still have a chance to do insta-kills I like the idea however, the damage could be made for guards only so they do only 50% damage but have 99% to disarm the weapon holder.
You can't insta-kill by shooting hand.
May be they should use clubs?
Though, this isn't realistic at all.
Chi si ritira dalla lottaE' un gran figlio di mignotta!