Evidenciary testimony demonstrates he never had a chance to do that since as soon as he asked GZ why he was following him, GZ asked him what he was doing there and Then TM's phone went dead after his headphones dropped to the ground.
http://www.hlntv.com/article/2013/0...y-determine-george-zimmerman-trial-day-4-fate
He had a cell phone, He could have called 911 or ran to the nearest house banging on the door if he was truly afraid for his life, It's very obvious by Rachel's testimony that Trayvon was right by his father's girlfriend's house at some point.
George was on the phone for 4 minutes or so, TM would have been long gone at that point and would have been back at the place he was staying.
RJ is a total liar (The only thing, I think she is being truthful is the fact that TM told her was right back at his father's girlfriend's house).
JMO