I just looked up the police report. It states that Martin was found in an area between two buildings, so he was not close to the street. So it does not appear that Zimmerman was at his truck when the incident took place. He may have been on his way back to the truck at the time, but it is hard to tell from the call transcript and the map. Based on where he described his truck being parked in the call and where the police report listed the body as being located, it looks like the shooting took place about 75-100 yards from his truck. A possible scenario, from looking at the map and reading the call transcript, is that Martin saw Zimmerman following him and took off running between the buildings. Zimmerman got out of his truck and followed him down between the buildings. After losing sight of Martin, Zimmerman may have been walking back toward his truck when the final confrontation occurred. If he had been following Martin on foot the entire time between the end of the call with the dispatcher and the time the shots were heard, he certainly should have covered more ground!
if a fatal show is fired. Assiming it went upwards from lower front to out of upper back, where does the body go? is the person still alive enough to stagger away?