How far was Zimmerman from his truck when the shot was fired?

Why did Martin approach Zimmerman with his hand in his waistband, stare at him and then turn and run?

Was Zimmerman in uniform?

Was Zimmerman on duty?

Why was Martin in the Neighbourhood?

Did Zimmerman continue to try to find Martin after Martin was out of sight and Zimmerman was told that the police did not need Zimmerman to follow Martin? If he did continue, was it at a walking pace rather than running after Martin? If Martin "eluded" Zimmerman by running away and outrunning Zimmerman, how did Martin come into contact with Zimmerman subsequently?.. was Martin "standing his ground" after running away?

Was the the neighbourhood searched for any weapons Martin might have been carrying due to the fact that he approached Zimmerman with a hand in his waistband? Was the neighbourhood canvassed for witnesses? Were any witnesses found? Were any statements taken? Was Zimmerman examined for physical trauma? If so, by whom?

I'll stop there...

Anybody have any answers to these very few (given the complexity and gravity of the situation) questions?