Where did you read the Police Report, I have not seen it in it's entirety?
I have heard the 911 calls and there is a minute of time missing, did Zimmerman or Traylon attack? Who attacked first?
Based on what you have said, and your reading of the Police Report are there any witnesses that saw the begining of the attack?
From everything I have read, again I haven't read the Police Report, there is nothing other than Zimmerman's account of how the physcial altercation started. If that is true and it was Trayvon who started it, case closed self defense. There is no probable cause. Even if Zimmerman was following him, Trayvon started the physical part, case closed. You can follow anybody you want, this does not give you a right to attack anybody. If there were no witnesses to the start of the physical altercation, and Zimmerman's story is consistent, no arrest should have been made.
I am sure there are people that know more about the law then me but I can tell you if someone physcially assaults me, and I have a gun on me, there will be no hesitation.
Again, from what I have read and understand there is about a mintue that nobody knows what happens. From the time Zimmerman starts going back to the truck until the time the withness called 911. My understanding is all we have is Zimmerman's account of that minute.