Don't get me wrong, I am in no way defending Zimmerman! Just pointing out that the original article left out an awful lot of key information about this case
Bit more to this one than that report makes out
http://www.scribd.com/doc/89763383/States-Motion-in-Opposition-of-Defendants-Motion-for-Immunity
Sounds like the difference is that she had the opportunity to leave, but instead went and got her gun and came back again