Richard Bridge: "I should also point out that if a man with a gun is following you, you are really quite likely reasonably to apprehend an intended assault, and are therefore entitled to use reasonable force in self defence.   So "Martin assaulted Zimmerman" is by no means a foregone conclusion."

Speaking of 'foregone conclusions' you seem to think that Martin KNEW that Zimmerman had a gun....would you, as an unarmed person, attack someone WITH a gun???
Your supposition, seems to have a bit of bias there, Ol' Chap!

Nobody KNOWS, not you, not Bobert, not any of us...so, as per aforementioned, 'Chill out!'

GfS