Asked him if he has a problem. Zimmerman said no, and Martin said, "well, you do now", and popped him in the face. Then, threw him down on the sidewalk and bashed his head a few times. Zimmerman somehow got to the grass, but Martin got on top of him and Zimmerman yelled for help. I'm not aware of any explanation that describes what happened after that.
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"Moderation in temper is always a virtue; but moderation in principle is always a vice." -Thomas Paine
The Constitution is not an instrument for the government to restrain the people, it is an instrument for the people to restrain the government."