Why couldn't a Fla. woman 'stand her ground' against abuser?

What happened to�Marissa Alexander sure sounds a lot like 'standing your ground': her abusive husband came after her, choked her, and when she finally broke free, she grabbed a gun fired a single warning shot into ceiling ... so why is she set to serve 20 years in jail?

Source: http://news.yahoo.com/why-couldnt-marissa-alexander-stand-her-ground-florida-162546331.html

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