Clearly, you haven't read the latest news. I fell for the original stories too, but should have known better - especially when being ginned up by the mainstream press. There's much more to the story and evidently Zimmerman has injuries to prove he was attacked and has a witness - which is why he wasn't charged in the first place.
Were Zimmerman’s injuries a result of him threatening Martin? The 911 tape clearly indicates Zimmerman was following Martin. Have you considered that Zimmerman’s injuries were the result of Martin defending himself?
Well the problem is this ... you can’t decide ANYTHING via news stories.
The police did Zimmerman no favors by not engaging in even basic investigation.