So, who would not belong there? I remember Toobin from CNN going step by step with the necessary requirements and he stated "TM belonged there b/c he was visiting his dad" and so forth. So, if GZ had no business being there what ground is he standing? He should have stood his ground in his car (stand your car dammit) like he was directed to do.
That's exactly how the law was meant to be interpreted. It is supposed to protect you if you're in your home, car, or business and can't get away.
Out in the open when you are the one following someone? Not really what they had in mind, and in fact if you click the link to the Gun Licensing page in my sig, it explicitly states that you can't wave a gun around at someone while making threats, you can't shoot someone because they said something you don't like, and you have to be in serious danger of your life or protecting someone else from harm.
George tried to say that he was scared of Trayvon who was slamming his head into the sidewalk, but the problem is they have witnesses who would say that when the gun went off they were not on the sidewalk, but on the grass. That's why the SA brought charges - they don't buy Zimmerman's story.