An amusing quirk of freshstarting these threads is that even the owner/administrator is labeled a "newbie".
On to the scenarios.
"1. Zimmerman left his Honda with his gun drawn. He sees Martin and tells him get his hands up. Martin refuses and struggles with Zimmerman over the control of the gun."
Let's see, wouldn't that be brandishing followed by kidnapping? I'd think only Martin would have a self-defense claim there.
"2. Same as 1, but this time Martin surprises Zimmerman from behind and starts to wrestle with him for control of the gun."
I presume this means " Zimmerman left his Honda with his gun drawn." but not the rest.
I think that's still brandishing, but one could argue that if Martin could sneak up on him from behind he could sneak away from him, so I think that theoretical discussion gets very messy very quickly.
"3. Zimmerman leaves vehicle with gun in holster. He claims that Martin comes up to him at the T in a menacing manner and he draws his gun instead of cellphone and then the struggle commences."
Here I think SYG, rather than just self-defense, gets dragged into the picture.
You must be humoring him, but because you must here goes. None of these scenarios disqualifies George from a SYG defense if in fact the tables turned, he withdrew from the altercation and was in fear of great bodily harm or death. Under 766.041 even an aggressor has the right to defense.
2011 Florida Statutes CHAPTER 776 JUSTIFIABLE USE OF FORCE
776.012 Use of force in defense of person.—A person is justified in using force, except deadly force, against another when and to the extent that the person reasonably believes that such conduct is necessary to defend himself or herself or another against the other’s imminent use of unlawful force. However, a person is justified in the use of deadly force and does not have a duty to retreat if:
(1) He or she reasonably believes that such force is necessary to prevent imminent death or great bodily harm to himself or herself or another or to prevent the imminent commission of a forcible felony; or
(2) Under those circumstances permitted pursuant to s. 776.013.
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.
The only other difference between these statutes is that with one you're protected against civil action and the other you're not.