I'm asking you a hypothetical. Just as you provided a hypothetical with the "bashing head in" comment.
Zimmerman had a gun, right? It is beyond the realm of possibility that Martin saw the gun?
Oh, in that case (hypothetical follows):
IF Zimmerman accosted Martin, grabbed him, waved a gun in his face, etc. THEN Martin would have been justifiably in fear of his life and could try to neutralize the threat (using whatever level of force was necessary).
(/end hypothetical)
At the moment I don't see that either can be proved or disproved. This may mean, under presumption of innocence, that Zimmerman walks. Whether that is just or not... maybe only Zimmerman knows. (It does seem - though maybe this is due to media hype - that the local police force screwed up the investigation. Actually, scratch that... they would've had to have bothered having an investigation in order to be able to screw it up).

