They just had Zimm's college professor on criminal procedures on the stand. He stated that Zimm was a very good student and should have known about Florida's self-defense law. He did course work on that defense law. But, in his interview with Sean Hannity, Zimm claimed he didn't know about the law.
Zimmerman also told Hannity that he was punched "several dozen times", I believe? And the blunt force trauma expert said otherwise.
it is my belief that many people will admit he used poor judgment, "fudged" the truth on more and more of these details in his various stories - but he didn't run to MURDER anyone.
And there's always the possibility (and not a bad idea) that he wanted to goad travyon into swinging - so that the police would show up right then and arrest him. He admitted on hannity that he was yelling for the police he knew were coming. Maybe that was the plan - and not a bad one, if that gun isn't on him. Tease trayvon, figure you can hold your own with MMA skills, and then his ass goes to jail when the police you called, show up.