Then, for some reason, you link an article stating that "sources say" Zimmerman "could be charged with a hate crime if evidence surfaces that the shooting was motivated by racial bias".
Where does any of this constitute probable cause to conclude Zimmerman committed a crime?
Seriously, I mean this. Take a step back for a second. Discard all the "depictions". It's just PERSON A and PERSON B. This "kid" and "skittles" and "community meeting slideshow" stuff is not relevant to whether or not a crime has been committed.
Regardless of anything else that occurred, answer this question, to yourself, and honestly:
Is it probable, based upon the evidence, that at the time Zimmerman fired at Martin, he did not reasonably fear death or serious bodily injury from Martin's attacks?
I remind you he was on his back, and screaming for help for at least 10-20 seconds, with Martin atop him and hitting him.
Can you say it is more likely than not and, indeed, probable that he was not in fear?
If you can answer yes to that question, then there's no use in continuing the discussion with you, because we will never agree on any of this.