Could be mistaken but my impression was, the timeline of 4 minutes gap started when Zimmerman lost sight of T and told the dispatcher that, and it ended when T surprised Z and knocked him down with a punch to the nose.
At the start of it, I believe T was about 80 yards from his apt. Instead of going AND STAYING there (appears from Rachel he did make it there) he returns to find Z and attacks him from out of nowhere.
It could not have been an accidental encounter, and it would’ve never happened if T went, and stayed, home.
I believe you are basically correct. The defense attorney paused 4 minutes in closing argument to show just how LONG that period of time is. We were glad Nasty Judge didn’t cut him off. He must have alerted her. I saw a great video made by the police when they took George back out there and he recreated the whole thing. He says he had Trayvon in sight, then on phone dispatch asked the address (kept asking it wherever he was). Since George was on back sides of houses or apartments, he walked ahead to next street to see what the street was and a close address, then he came back and could not find Trayvon. He had lost him. Then out of the blue he was attacked. He speculated Trayvon came from behind a bush. Trayvon was stalking George at the end.