The problem with that is that from the time on the audio tape that you hear Zimmerman exit the truck to the time of his response of "OK" to the dispatcher "once the operator told him to do so" was 18-seconds.
In that 18-seconds Zimmerman would not have traveled the distance from the truck to the event site behind the building where the event took place. When the timeline of the dispatcher call and the "OK" is synced with the shoot being recorded on the 911 call form the neighbor then Zimmerman would have had about 3 minutes to 3 minutes 30 seconds being between his "OK" and the shot being fired.
There are two possibilities. First, Martin attacked Zimmerman and knocked him unconscious and the dragged him down the street, around the north end of the building, then woke Zimmerman back up to then commence further assault so that Zimmerman would be conscious to fire the shot OR Zimmerman continued to move away from the truck after Martin after the "OK" and arrived at the event site under his own power.
Average walking speed is 4.5 feet/second (double that to a jog at 9 fps).
At walking speed Zimmerman would have covered 79.2 feet | 26.4 yards. We know he did not sprint at full speed because he continued a conversation with the dispatcher and there was some wind noise, but no background noise evidence of heavy breathing or the jerkiness of speech that would result in running. So let’s say he moved at light jog of double normal average speed. That would be 158.4 feet | 52.8 yards.
The distance from the truck area, east along Twin Trees Lane, along the sidewalk to the north of the building, and from the sidewalk "T" south along the sidewalk between the backyards was about 105 yards.
If you would like to research yourself, Google "Average Human Walking Speed". Then using Google Earth, you can use the path function to measure distances between multiple points you designate from start to end. Use "Path" instead of "Distance" because distance from point "A" to "B" would be "as the crow flies" meaning Zimmerman would have had to go through the building. Use the address of "1230 Twin Trees Land, Sanford FL" and it will display the right area. Distance measurements are under the "Tools" menu.
Actually there is. One the distance involved (see above) and two the girlfriends statement that Martin indicated the unknown man was following him and getting closer.
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Hmmm, so there is approximately 3 min's & 30 seconds between the "OK" and the event site, where we have no accounting for or answer for at this time upon where Zimmerman was actually at within the time frame or where Martin was actually at in the time frame correct? All we have is speculation in which as you have already listed, where there are various possibilities in such speculation as is noted by you above, but are there more possibilities maybe?
And that's the issue that BOTH sides don't want to do. Examine multiple scenarios against all the evidence to see how it fits. Commonly someone per-decides that Zimmerman was at fault or that Martin was at fault and then argues based on that emotional position.
Basically we have:
Scenario #1: Zimmerman was out to commit murder, found a subject, and is fully responsible for Murder. (This appears to be the case the State will try to make.)
Scenario #2: Zimmerman acted with no pre-decided intent or disregard for human life but initiated hostilities.
Scenario #3: Zimmerman acted with no pre-decided intent or disregard for human life and Martin initiated hostilities.
Under scenario #3, Zimmerman would have retained his self defense immunity as it was Martin that initiated hostilities. Under Scenario #2, the state would have to show first that Zimmerman initiated hostilities. Then they would have to show either (a) the extend of those initial hostilities, or (b) that Zimmerman after the initiation of hostilities and at the point he was losing the fight that he was presented with an opportunity to retreat. Even if Zimmerman started the hostilities, it is possible that he retained self defense immunity, but that question would have to be answered first. Scenario #1 appears (from the public evidence) to be a very weak case on the part of the prosecution.
During this time we have Zimmerman on the phone with the dispatcher and Martin on the phone with his girlfriend. Zimmerman's call ends at 19:13:41 or 19

11 (depending if you go my dispatcher logs for external phone records). Martins call with the girlfriend ends at approximately 19:16:00 (based on phone records). The shot recorded by the 911 tapes takes place shortly after the girlfriends call ends and police report being on scene at 19:17.
The big unknown right now is exactly what Zimmerman said to the police that night. Remember, at the time it is very, VERY unlikely that he knew Martin was on the phone at the time that the event started and much will depend on his credibility as viewed by the jury. **IF** his story is that he approached Martin while Martin was on the sidewalk between houses and that Martin initiated hostilities - then that actually supports his credibility since Zimmerman's story matches closely that of the girlfriend. On the other hand **IF** Zimmerman's story is that Martin was hiding and jumped him, then (IMHO) that detracts from Zimmerman's credibility because it does not make sense under the known facts (i.e. Martin was carrying on a conversation on the phone at that exact time and it makes no sense for someone to hide to ambush while they are talking on the phone).
Then there are other issues that expert witnesses will need to be brought in to explain. If Zimmerman's story is that Martin was on top of him beating his head against the ground then:
(a) I'm the same height as Martin (71") with an arm length of 22" to the wrist. If Martin his his hands on Zimmerman's head and is flexing his elbows up and down (to create the beating head motion) then chest to chest Zimmerman and Martin will be 12-18" apart with Zimmerman under Martin. The straight front to back trajectory of the bullet through Martin's chest would require that Zimmerman pull the weapon and maneuver it between them pointing it "down" towards his feet (an unnatural wrist movement) to achieve that shot. A more natural shot would have been to remove the gun from the holster, place the weapon against Martin's side and fire. That would have created a side entrance rising into Martin's chest instead of a straight front to back. The second thing is that there was no Gun Shot Residue on either Zimmerman's jacket or shirt from such a close proximity shot. One would think that with them being that close that blow-back would have deposited GSR on Zimmerman and that gravity would have cause some material to fall down (since Zimmerman was under Martin).
That actually gives raise to possible 4th and 5th scenarios. That being in those critical couple of seconds before the shot was fired that, Zimmerman twisted and pushed Martin off and either: (a) pulled his weapon and fired, with arm extended away from his body into the center of Martins chest (No GSR, Straight Trajectory) with no delay even with separation (about 2 feet, arms length), **OR** (b) same thing but this time Martin attempted to re-engage Zimmerman resulting in Zimmerman firing his weapon.
It will be interesting to see how Zimmerman's accounts from that night and the video of his reenactment the next morning compare with facts that can be established and the forensic evidence.
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