There is not one shred of evidence Zimmerman was defending himself

[Sheepshank]

65. The injury on the back of the head easily could have resulted in one fall

bad footing, being punched once in the face (nose) and falling backward.

If there were multiple contusions (which I haven't heard about), then repeatedly banging Zimmermans head on the pavement would be a more problematic. But a defensive punch in the face resulting in Zimmerman losing his footing and falling backward onto the pavement slamming his head "feels" much more likely to me. My daughter on the baskteball court was caught off guard, pushed hard and fell backwards and slammed her head onto the floor. 3 weeks of concussion...but instead of a wooden floor, it there had been concrete, I could see a laceration resulting for that particular slam.

The brother's public statement that Zimmerman had to shoot in self defense or end up wearing a diaper, is so out of the realm of reality that it brings that repeated testimony into question. It's what Zimmerman told his family, it's what they are repeating and no evidence supports that. Zimmy paniced, was outmatched by a stronger more fit teen, and in his panic knew he realized he made a huge mistake.

He shot Trayvon for no "good: reason. The only possible combination of reasons are that his narcissistic need to be a hero clouded any possible good judgement, and he shot a kid in part to cover the mistakes of the evening, in part because he panicked, and in part because he really did realize he put himself in a no win situation, and his ego needed a masterful boost...the gun. Oh, and because he's an idiot. Idiots carrying guns, showing them off to instill fear and create a false sense of power, seems to be an on going problem and hardly a one off.