That is his job, he is a guard.
Guards follow people around in the dark all the time. It is not that strange of an occurrence. If he just walked up to him to ask what he's doing, that's not intimidation. At no point did anyone suggest he walked up to Martin, gun waving, going "omg kid get out of my neighborhood I'm gonna shoot your face". That would be intimidation. Going up to someone and going "hey, what are you doing here" is not that.
I don't understand why race matters. I said it. I don't. It doesn't matter to me, it doesn't matter to my family. It seems like a petty, kind of shallow way to try to divide people. I'm friends with people of every race, even *gasp*, white and black people. It's not that big of a deal to me, I was not raised to make it a big deal, so no, I do not understand.
I am defending his right to use force against force if someone attacks him(which is what we can prove happened), because we all know damn well that "No stop it" does nothing to stop the guy bashing your head into a curb.
And I'd want a law that doesn't entitle a guy to shoot me with impunity any time he picks a fistfight with me and then loses. That's insanity.
Let's take this to an extreme for a moment.
Guy walks up to you. Guy starts insulting you and your significant other. You punch the guy. Guess what? You were still wrong. You threw the first punch. You are wrong.
That is what happened. Zimmerman walked up. He talked to Martin. Martin attacked. This is the most credible example of the chain of events that we have. Martin was in the wrong.
That's not a hard concept to grasp. Even if someone 'picks a fight', if you throw the first punch you are wrong. The end.