I don’t recall stand your ground as being raised in the Zimmerman trial.
"Stand your ground" is persistently used when it doesn't apply.
Self-defense immunity is not stand your ground.
"Stand your ground" doesn't have to be raised, it's part of the self-defense law covering whether a defender has a duty to retreat.
Neither this case nor the Zimmerman case were "stand your ground" cases, because neither involved an opportunity to retreat.