[Cletus.D.Yokel]

I think wtc911’s intent was to provide evidence that Martin was the first to assualt. If that is what is asked, then, no - there is no such evidence.

Z could have grabbed M’s arm (assault) prompting M to punch Z in “self-defense”.

Ultimately, though, that is irrelevant to the shooting.

[wtc911]

You got half-way there. What happened in the few minutes between the end of Zimmerman's call and the first 911 call is and will likely remain totally unknown.

All we have are speculative scenarios. Here's one that fits what we know - which is that Martin took steps to avoid a confrontation (he ran) and Zimmerman took active steps to close the gap (he got out of his car and followed)...

Zimmerman and Martin, either by design of one or my pure bad luck for both of them, find themselves face to face. Martin is angry at being followed. Zimmerman is intimidated and either reaches for or shows the gun. If this happened (and it is as likely as any scenario) then Martin had every right to beat the stalker with the gun into submission.

My thinking on this is that Zimmerman is a jerk who got in over his head and had to shoot his way out.