SYG had no, zero, none, nada bearing on the trial of Zimmerman.
There was no need to use it as a defense.
SYG says that you have no duty to retreat. Period.
It is hard, if not impossible, to retreat when you are being straddled and pinned down while being beaten.
But...."never let a crisis go to waste". So they are conflating Self Defense with Stand Your Ground.
And, sadly, many people are too poorly informed to be bothered to understand the difference.
And the media is, of course, complicit in the confusion.