This is a supposition that might make sense:
Martin goes between buildings and turns right.
Zimmerman goes between buildings farther down and turns left to go back to his truck:
Please excuse the artwork. :goodvibes[/QUOTE]
They didn't go between the building though. I think there was a picture of Zimmerman's route somewhere on this thread. Its supposed to be straight to the end of the sidewalk that intersects the path. That's where he ended is call. The fight happens on the path. He claims he was walking back to his car. That would put him further down the path at some point. If he wasn't looking for or following Martin, he wouldn't be on that path at all.