http://backwoodshome.com/blogs/MassadAyoob/Scroll down to Pt. 3 "Unarmed teen" 3rd para.
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First, the haters (like the prosecution) assiduously ignored George Zimmerman’s statement that while Martin was “ground-and-pounding” him, Martin saw Zimmerman’s gun in its now exposed holster, told Zimmerman that he was going to die tonight, and reached for his victim’s pistol.
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If I’m your criminal attacker, you don’t have to wait for me to shoot you before you can shoot me to defend your life, and you don’t even need to wait until the gun is in my hand. If I announce my intent to murder you and reach for a gun, I’m bought and paid for right there. And it doesn’t matter whether the gun I’m reaching for is in my holster, or yours. That’s why every year in America, when thugs try to grab a policeman’s gun and are shot, the shootings are ruled justifiable.
Finally, we have the clearly proven element of Martin smashing Zimmerman’s head into the sidewalk. If I picked up a chunk of concrete or cement and tried to smash your skull with it, you would certainly realize that you were about to die or be horribly brain-damaged if you didn’t stop me. It would be what the statutes call “a deadly weapon, to wit a bludgeon.” There just isn’t a whole hell of a lot of difference between cement being smashed into head, and head being smashed into cement.
Clearly, Trayvon Martin possessed the power to kill or cripple Zimmerman.
That is why, under law, Zimmerman was justified in defending himself with a per se deadly weapon.
The jury got it.