The Stand Your Ground law does not permit the use of deadly force against an initial aggressor unless “the person reasonably believes that he or she is in imminent danger of death or great bodily harm and that he or she has exhausted every reasonable means to escape such danger.” Ordinarily, one would expect that a reasonable force requirement would provide ample protection against idiosyncratic or morally suspect behavior. But this is not the case when victims happen to be black.

http://www.nytimes.com/roomfordebate/2012/03/21/do-stand-your-ground-laws-encourage-vigilantes/racism-is-the-problem-not-the-stand-your-ground-laws