There has been testimony establishing that there was some sort of verbal interaction between Zimmerman and Martin before a physical one. Who struck the first blow and why? If Martin struck the first blow, as the defense contends, could that be considered an act of self-defense?

Regardless of who struck the first blow, some testimony suggests that Martin was getting the best of Zimmerman. In that scenario, could the right to self-defense switch personage? Florida law seems to suggest it can. The law states that the use of force is not justified when a person “initially provokes the use of force against himself or herself, unless 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.”

Even assuming that Martin was winning a physical fight with Zimmerman, did Zimmerman “reasonably” believe that he was in “imminent danger of death or great bodily harm”? Zimmerman was injured, but how do you evaluate the degree of those injuries? Independent assessments may or may not deem Zimmerman’s injuries severe, but did Zimmerman, in the middle of the fight, believe them to be? Had Zimmerman “exhausted every reasonable means to escape”?

Who was yelling for help? Keep in mind that it is possible to be both winning a fight and simultaneously yelling for help.

During opening arguments, John Guy, a prosecutor, stated that investigators found none of Zimmerman’s blood on Martin’s hands or on the cuffs of his sweatshirt. How will the defense explain that?

The bar may be high for the prosecution, but the logic is basic: there has been no suggestion or testimony that Trayvon Martin was doing anything wrong the night that George Zimmerman caught sight of him and grew wary of him, pursued him and came into contact with him.

Zimmerman set that night’s events in motion and rendered them still with the ring of a gunshot. Now, as Zimmerman sits in a Florida courtroom, Martin sleeps in a Florida grave. We will never hear Martin’s side of the story, about the level of his fear or the feel of the bullet ripping through his body.

Morally, Zimmerman is by no means without guilt. Legally, it remains to be seen whether he will be found guilty of second-degree murder.