you don't know how is nose was broken, if it was broken, or when it was broken.
ditto the head.
he didn't look badly hurt to me, and if he was, that does not prove the dead kid did it, or that he didn't deserve it anyway.
Very true. The catch is that the prosecution has to prove beyond a reasonable doubt that Zimmerman murdered him and did not act out of self defense. To me it is reasonable to assume that Zimmerman acted out of self defense given the extent and location of his injuries. You can say that ZImmerman did them to himslef or whatever. You may even be right. But it is not beyond a reasonable doubt.