Well, that whole getting the crap kicked out of him thing might be a defense. Especially if you look at his narrative, listen to the released 911 tapes, and take into account the defensive wounds Zimmerman reportedly suffered.
Or... You can just take the MSM/CBC narrative and stick to it despite any contradictory witness info...
I actually haven’t paid much attention to the MSM narrative. The facts I gathered independently have strongly suggested a wannabe cop who also wanted to be a hero to his community being at the root of the whole situation going up against a mostly-good kid who wasn’t doing anything wrong.