And, if Zimmerman had ran after him, you would have heard his heavy breathing on the call.
Pursuit does not necessarily have to involved running. He could have just continued looking around the area. Either that or he stuck around the area to wait for the police without heading back to his vehicle... at night, in the rain. Which considering he believed that there was a suspicious and potentially dangerous person around would be just about as stupid as pursuing. And if Martin ran and Zimmerman did not continue to pursue, what opportunity would Martin have to initiate the altercation? Are you saying that after running that he turned around and decided to pick a fight then? Seems like contradictory behavior to me.
1) If someone is running away from you, the only effective pursuit strategy is to run after them [or get back in your car and drive towards where they ran.] The alternative to assume that they had ran away, which is what Zimmerman's father said that Zimmerman did.
Zimmerman's father noted that the police asked Zimmerman for an address, and, in response, Zimmerman was walking on the sidewalks towards the front of the townhouses so that he could read an address.
2) Since we know for a fact that Zimmerman was not running in pursuit, we know for a fact that Martin could have ran all the way back to to his father's house without meeting Zimmerman. For some reason, Martin took a path that led him back towards where Zimmerman was when he exited his car.
3) Whether Martin doubled back purposely to confront Zimmerman, or their paths happened to cross, Martin's girlfriend heard the initial exchange as Martin asking if Zimmerman had a problem; Zimmerman asking Martin what he was doing; and a scuffle breaking out immediately disconnecting Martin's headset. [Zimmerman's account is Martin asked him if he had a "f------ problem?"]
It is odd that a man would ask someone a question and not allow time for a reply.