"Standing your ground" is not attacking someone who you think "has a problem." If anything, Zimmerman stood his ground after this innocent child broke his nose and beat his head on the pavement.
Part of the Florida Law says
776.041 Use of force by aggressor.—
The justification described in the preceding sections of this chapter is not available to a person who:
(1) Is attempting to commit, committing, or escaping after the commission of, a forcible felony; or
(2) Initially provokes the use of force against himself or herself, unless:
(a) Such force is so great that 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 other than the use of force which is likely to cause death or great bodily harm to the assailant; or
(b) In good faith, the person withdraws from physical contact with the assailant and indicates clearly to the assailant that he or she desires to withdraw and terminate the use of force, but the assailant continues or resumes the use of force.
Section 2a might get him off. But his problem again is he pursued the child. It's kinda hard to claim imminent danger or anything else when you still followed the child after being instructed to not do that.