First, 17 years old is a man...at 17 I was in a uniform at basic training at Ft Dix, NJ...Alpha 4, leads the way - Alpha Company, 4th platoon, 26th Infantry Regiment.
Second, if you believe Martin was on top of Zimmerman beating his head against the ground, while Zimmerman was screaming for help, the case is over.
My best friend went to prison for the same...five years for beating a man's head on the ground after he was on the ground.
Third, I've had my bell rung more than a few times...I remember one in particular when I was hit so hard my vision went black...it went and it came back in an instant...but it could have just as easily been lights out.
You can feel like you could lose consciousness getting your head smashed over and over and still have the presence of mind to defend yourself before that line is crossed.
Fourth, there are no witnesses to encounter, Zimmerman could have said anything, Martin may not have given him a chance to say anything, all there will be is Zimmerman's word and zero refutation.
Last, Zimmerman can't be expected to think clearly while he is under attack and getting his head slammed into concrete, or a rock or whatever.
I've experienced shock, and I wasn't injured or being assaulted at the time...I'll link to the experience. I wrote a post about it.
All Zimmerman has to prove is that he was in fear for his life.
That's it...we can say "I would have done this differently, or that differently"...we have the benefit of hindsight...we go in knowing the outcome, and I think we forget that sometimes.
When I look at Zimmerman's actions, they seem to me to be reasonable.
Zimmerman didn't know Martin...for all he knew Martin was a murderer.
He didn't have 200,000 hour of media background on Martin to weigh while determining whether Martin was going to beat him to death.
He didn't know Martin's age, his history...all he knew was he was trying to protect his neighborhood and this guy who he already suspected was on drugs and up to no good, was slamming his head into the ground repeatedly without any indication he was going to stop, and no assurances that help would get there before Zimmerman was dead, and his killer would escape...possibly with Zimmerman's gun!
In the same situation, only knowing what Zimmerman knew at the time, I can't say that I would not have made the same decision.
And that is the real bottom line. In the same circumstances, if you truly believed your life was in eminent jeopardy, would you make the same decision?
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EDIT --- Link to my post on the effects of shock...not my finest hour, but an experience I will never forget.
Murder or Self-Defense