I read the transcript here and dont see any evidence of racismhttp://bizsecurity.about.com/od/creatingpolicies/a/A-Transcript-Of-The-George-Zimmerman-Police-Call.htm
Lets be honest here the final part of that transcript sounds like he is returning to his car, shortly after he puts the phone down to wait for a cop he says he was attacked by the victim,
lets think about this one logically, as the victim if you think you are been followed do you:
A: Call the police and or family
C:Confront the person following you
Now it sounded like he ran in the first place, then came back... if you thought someone was a threat why would you come back and confront them? surely you would have to think that you could defend yourself against them to even consider the option?