The "stand your ground" comes in when the police and/or DA don't think they can reasonably prove that Zimmerman didn't feel threatened. To a lot of us it's clear the police made a bad call, but they wouldn't have been able to make that (possibly racially biased) bad call if they didn't have a drastic standard of evidence to prove that Zimmerman didn't feel threatened - rather than Zimmerman having to show why HE felt threatened.
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not really back, you didn't see me, i was never here shhhhhh
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