yep, exactly, I bet ya Zimmerman would have left that concrete, quite likely permanently damaged for rest of his life, in an ambulance and while the cops likely would have never caught Trayvon to be convicted of the aggravated assault due to all of the political nonesense.
I truely doubt Trayvon would have been convicted for the aggravated assault if this case "now as it is" giving many indications of the outcome if it were just aggravated assault. It would come down that, Zimmerman deserved the aggravated assault for doing is duty and being an over zealous neighborhood watch fella, that is following and watching Trayvon to make sure he was not up to no good, and Zimmerman covertly being some supposed racist thus indicating he deserved the aggravated assault.
These exactly are the reasons why folk need something to defend them self, be it a gun, knife, or high powered tazer. Then, with how things go nowadays, Trayvon probably would have died from being hit by the tazer due to a weak heart or something and still the court case would go as it is now.
So, essentially, the moral of this story. If you see something very wrong, then do not even attempt to investigate nor ever intervene, just sit on your hands, call the cops, and do nothing irregardless of what is happening due to the fact you will likely get blamed for taking action such as simply following a kid to make sure he is not up to no good.