ACCORDING TO ZIMMERMAN:
He first spotted Martin as he entered the housing complex. He drove past him and parked at the clubhouse to wait for him. Martin observed him both times, but passed him and continued on his way.
Zimmerman then pursued again, driving after Martin and parking. Martin passed him yet again. Zimmerman opened his door. Martin, seeing this, ran.
(NOTE: Zimmerman's account of this second encounter is "fluid" -- in one version he has Martin running from behind the buildings to circle his vehicle -- while acting menacing -- before running off behind the buildings again.)
Zimmerman takes off after Martin on foot. The dispatch, hearing the wind noises and Z's shortness of breath asks "Are you following him?" to which Zimmerman responds "Yes."