There is a site called Wagist...I have no idea who these people are.
But, they put together a timeline and maps...and showed that Martin had more than enough time to go home, instead of face Zimmerman.
It just makes sense, really. Zimmerman is following Martin...what, did he outrun him? Of course not - Martin confronted Zimmerman.
[Wagist timeline] Evidence that Trayvon Martin Doubled Back
FR thread with the Wagist link
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Another timeline by Freeper PhatHead