I would suggest by demonstrating Martin was not a sociopath.
If Martin has no history of unprovoked violent attacks then it seems highly unlikely he started it.
What you actually have to prove though is that Zimmerman was in fear of his life.
The burden of proof here actually is on Zimmerman, because he has to demonstrate that his manslaughter was not murder - he is not disputing having killed Martin, the question is whether that killing was justified and the law usually assumes it isn't.
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