From a timeline and measurements I put together the other day in a different discussion at a different place:
From the clubhouse porch where it is thought Trayvon stopped to raise his hood to the corner of the sidewalk where he turned to go home is 412 feet. At a walk it would take a little over a minute and a half to travel. If he started just before 19:12, that would get him to the corner of the sidewalk at 19:13:30. Running of course would be faster and put him there sooner.
GZ's call ended at 19:13:45. From where his truck was parked to the next street past where Trayvon would have turned is 344 feet, then 93 feet back to the corner of the sidewalk. It would have taken GZ over a minute and a half to walk that distance. If GZ left after the end of his call to SPD that would bring him back to the corner at 19:15:10.
The girlfriend's call ended at 19:16. She described hearing Trayvon ask "Why are you following me?" and a man ask "What are you doing here?" So Trayvon had a couple of unaccounted minutes and GZ had not quite a minute unaccounted.
Trayvon's body was found roughly 40 feet up the path - it would take about ten seconds to travel that distance. But let's deal with the couple of minutes that Trayvon "lingered". He thought he had lost his follower, he's talking to his girlfriend. When he gets back to where he's staying, his 13 year old soon to be step brother will be there. I don't know about you, but when I was dating, I didn't want my little sister listening to my calls to boyfriends. IT DOESN'T MATTER WHAT TRAYVON WAS DOING - he was not doing anything illegal. He was talking to his girl - the first and last love of his life, apparently.
We'll never know what GZ was doing with that extra 50 seconds - stalking Trayvon?
I think Trayvon had turned the corner and was spending time before he went back to the townhouse. Then this strange man who'd been following shows up. Exactly what happened in those last forty four seconds of Trayvon's life is known only to George Zimmerman, but from the tone of those screams, Trayvon was being terrorized by this vigilante who then shot him.
IMO, JMO, etc.