Well the uselessness of it, is you could fire a warning shot before if you wanted....so adding the 'ability' to fire a warning shot, is just a move to later down the road make it a requirement (if no altercation has already started possibly) But there are situations where no one has layed hands on you yet, but still may warrant you to shoot to protect yourself.    Let's say for example, a guy is running right at you. The lawyers could argue he hadn't done anything yet, and may only been trying to scare and never intended to do anything. This kind of leaves some loop holes for some people to claim people used SYG prematurely.    The true hidden purpose of this change, it seems, is to give negros a warning shot so they can run away and find easier prey instead. So this is actually detrimental and will result in more victims than before. Let's say zimmerman had a chance to fire a warning shot, did, and then trayvon ran away and no one was killed that night. At some point after that, trayvon would have found another person to victimize....and another...and another....until he was killed or arrested.