Reported a short while ago in the Orlando Sentinel:
With a single punch, Trayvon Martin decked the Neighborhood Watch volunteer who eventually shot and killed the unarmed 17-year-old, then Trayvon climbed on top of George Zimmerman and slammed his head into the sidewalk several times, leaving him bloody and battered, authorities have revealed to the Orlando Sentinel.
That is the account Zimmerman gave police, and much of it has been corroborated by witnesses, authorities say.
Zimmerman has not spoken publicly about what happened, but that night, Feb. 26, and in later meetings he described and re-enacted for police what he says happened.
In his version of events, he had turned around and was walking back to his SUV when Trayvon approached him from behind, the two exchanged words then Trayvon punched him in the nose, sending him to the ground, and began beating him.
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Zimmerman also claims that Martin tried to take his gun.
And there’s an account from the 13-year-old witness:
In addition, an eyewitness, 13-year-old Austin Brown, told police he saw a man fitting Zimmerman's description lying on the grass moaning and crying for help just seconds before he heard the gunshot that killed Martin.
The latter paragraph confirms my hunch that Zimmerman was on the ground and not in a position to run away, thus the “stand your ground” law is irrelevant, Zimmerman’s actions would be self defense in any jurisdiction.