Right, so it's almost at the same exact time. GZ says he went running when at the same time TM is telling the GF I'm not going to run.
I see it as TM had already run by the time he talked to his girlfriend in that last call. There were three incoming calls from her: 6:54, 7:04, and the last one at 7:12 (from the screenshots of TM's phone logs shown during that ABC News segment). According to the screenshot, that call lasted 4 minutes.
I wonder if the call that started at 7:04 was disconnected during the time that TM was first trying to evade GZ - maybe TM disconnected at the time GZ said "He's got his hand in his waistband." That would have been right at 7:10. Then TM came closer to GZ's car, maybe just walking past it but close enough to make GZ nervous. Sixteen seconds later GZ says, "Somethings wrong with him. Yup, he's coming to check me out, he's got something in his hands, I don't know what his deal is."
It's fifty seconds after that, a few seconds before 7:12, that GZ says he's running - my timeline has it nearly twenty seconds before 7:12. I think in that minute and a half or so, TM stopped under the clubhouse overhang, put his hoodie up, watched this guy he'd noticed watching him, and decided to jog out of sight, in between the rows of townhouses.
About the time TM got out of GZ's sight would have been when the girlfriend's last call connected. GZ was on the phone with the dispatcher until right about 7:13:40 - the dispatcher made the final entry at 7:13:41.
This is where the various stories diverge. GZ's original story to police, as told to Tracy Martin by the lead detective is that after he got off the phone with the dispatcher, TM came up to his window and asked why GZ was following him. If that had happened before 7:12 the dispatcher would have heard it; after 7:12, the girlfriend would have heard it.
There is no time for that encounter to have happened after the girlfriend's call was disconnected at 7:16 because the 911 calls began at 7:16 with the call that has the screams in the background. That call places the location of whatever was happening between the townhouses, close to the spot where Trayvon's body was when the police arrived at 7:17. During that 911 call, the scream are heard for 44 seconds when the shot is heard.
Whatever slack there is in the timeline after 7:13:40, there does not seem to be a way to reconcile the stories - GZ's recorded call with the Sanford PD dispatcher, the story the lead detective told Tracy Martin the next day as GZ's version, the different versions GZ's family and friends have told (which I really don't think are accurate), and the girlfriend's story.
There are just over two minutes where TM was talking to his girlfriend; and where we don't know where GZ was. GZ said he went to the next street realized where he was and turned around - on one version of his story, not sure which one that was - the one his father told? Concerned Papa tried different scenarios based on measurements and estimated travel time. I'm not sure if I agree with his conclusions - it's all too iffy.
The facts we have now are the recordings of the calls and the logs of the call times. That's what I keep going round and round with, trying to make sense of it.
All the times I have come from those sources and from me listening to the recordings and noting times for various parts of the conversations. My times could be off. The information I have to work with could be wrong.
This is the best information I can put together from what is publicly available. The interpretations are my opinion only.