I would be careful quoting the GF...if you want to take part of her story you have to take all of it...and it has zimmerman still following martin...not going back to his truck.
I'm not sure why that's a problem. It's perfectly legal to get out of your truck, and even to follow somebody - even to ask them what they are doing in the neighborhood. And it really doesn't contradict Zimmerman's account in any way.
The important point of DeeDee's account (as it has been conveyed in the press anyway) is that it was Martin who confronted Zimmerman.
And I have to tell you, I just keep coming back to the indisputable fact that Martin had ample time to return home, without even running, before Zimmerman ever hung up the phone with police. It is also indisputable that he did not do that. And I just can't square that with the version that has Zimmerman "chasing" him.