There's more to that tape. Zimmerman is headed back to his car and suddenly Martin shows up.
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Just for laughs...how about you detail the dialog on the tape that states this.
The
Orlando Sentinel contacted the voice identification experts. Both determined it was not George Zimmerman who called for help. Using different methods they took all the screams, put those together, and cut out everything else. You can listen to the extracted screams at the Sentinel’s site.