I doubt if anyone denies there was an altercation.
How do those stains show who started it?
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Where did I say or suggest that grass stains had anything to do with the question of who started the physical altercation?
What I did say was that the grass stains (and their respective locations on the two guys), the injuries to Zimmerman and the close contact nature of the gun shot are all factors favorable to the defense of justification.
By the way, assuming Zimmerman testifies and says, "Yeah, I did follow the kid, but he then approached me and started beating on me and he knocked me down and he was cracking my head onto the ground," let's focus. Who on the State side is going to offer evidence to dispute those things?
How are they going to dispute those things?
So, let's say that Zimmerman testifies along those lines and thereby raises sufficient evidence for the justification defense. The STATE then has the obligation to disprove it.
I am kind of curious what they will point to in order to meet THEIR burden once the defense is raised by the defense? It won't be the PHYSICAL evidence. That's pretty clear. The scientific/physical/forensic evidence appears to support the defense even to the point of suggesting that if Zimmerman had not had a weapon on him, he might not even be alive today.