How do you know Zimmerman didn't head back to the car?
Location, location, location.
You don't know where Zimmerman was when he agreed to give up following Trayvon. Maybe where the shooting occurred was on the way back.
However, we do know precisely how long Zimmerman was moving from the point he exited the truck (you can hear it on the tape) to the point where he acknowleged the dispatchers instructions not to follow the unknown individual. That time difference was 18-seconds.
Zimmerman was on the phone talking to the dispatcher, we know from the sounds that he was not sprinting. A brisk walk is approximately 4.5 feet per second (3 mph). This can be researched by reviewing studies. That's a 20 minute mile. 5280 feet divided by 20 minutes is 264 feet per minute. 264 feet divided by 60 seconds equals 4.4 feet per second. Over 18 seconds that 79.2 feet (about 27 yards).
18 Seconds to travel outbound 27 yards and he had 2:30-3:00 from acknowledging the instructions until the actual event occurred and the gun fired, 60 seconds later the first police arrived on scene.
From the beginning of the walkway to the at the corner of Twin Trees Lane around behind the building to to the scene of the event is approximately 70 yards. (IIRC) it's about 120-130 yards to the middle of Twin Trees Lane between the turns and 158 years back to the left turn.
Depending on exactly where Zimmerman's truck was parked he would have never reached the event site if he'd turned around to return to the truck when instructed to do so. Zimmerman must have continuted to travel away from the truck to arrive at the event site.
(Disclaimer: While Zimmerman had to move away from his truck, that still may not indicated who initiated hostilities, it could have been Zimmerman or it could have been Martin.)
And, you don't know where Trayvon confronted Zimmerman.
We don't know if Martin confronted Zimmerman or if Zimmerman confronted Martin.
We don't know if the person initiating the contact is the person who initiated hostilities.
It could have been near the SUV and Zimmerman ran, to get away, to where the shooting happened.
Unlikely as there are two independent sources that didn't know about each other that confirmed Martin ran - Zimmerman himself and the girlfriend.
But, you do know if Trayvon wasn't planning on attacking Zimmerman, he would have been long gone.
Under Florida Stand Your Ground, if Zimmerman had been pursuing Martin, Martin would have been under no requirement to retreat (the law works both ways). However, Martin had already shown, based on Zimmerman's own words in the tape, a willingness to depart the area as opposed to initiating confrontation.
When looking at the map, the most logical exit from the truck area for Martin was to take the sidewalk around the building as it would break sight with the unknown individual in the truck who was acting funny (from Martin's perspective). Once he broke sight with Zimmerman, he may not have known Zimmerman was attempting to follow and then slowed to tell his girlfriend what was going on.
You do know that Zimmerman credibly lost track of Trayvon.
And we know that Zimmerman exited the truck to pursue/follow/chase Martin.
You do know that Trayvon is a piece of shit.
No we don't. We do know however that Martin had already demonstrated a willingness to leave an area prior to a confrontation and we do know that Zimmerman was willing to travel toward a possible confrontation.
DISCLAIMER: The above is provided as a counterpoint to an obviously biased perspective. At this point there his no public information as to who initiated the confrontation and who initiated hostilities (they could be different people).
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