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Unless they were wrestling for control of the weapon.
Without any eyewitness to say, it is just as possible that Zimmerman showed the weapon, Martin felt threatened and the fight began. Remember, Zimmerman's own brother said that they were fighting for control.
So, the question that bears repeating is...
Exactly when did Martin realize that the guy who had been following him was armed? When and in what manner did Zimmerman show it?
While stopped there he sees a "stranger" walk into the development past him. That's Trayvon who is returning from the 7/11 to go to his father's girlfriend's townhouse.
He can get there by walking around the roads or by walking part way along the road to his left, then getting on a sidewalk that leads to a long sidewalk going N/S and past the rear of the townhouse he's going to.
George turns his SUV around and comes back following Trayvon, but stopping at his home ~ in this case just pulling up in front rather than into the drive.
CLUE: EVERYBODY who makes a left turn on the second street in that runs past the clubhouse will drive or walk past George's home.
So, Trayvon goes past George's house and gets onto the sidewalk that leads to the back entrances.
George somehow gets from his truck ~ parked in front of his house ~ to the same sidewalk where Trayvon is found dead. There are two routes. One is for George to take pretty much the same path as Trayvon and follow him around. The other is for George to go through his own home to the sidewalk in the rear, run a half a block South (which is why he's winded) then turn left to cross through a cut-through between the houses, cross the street, go left again to another cut through where he turns right.
That'd pop him out on that sidewalk where Trayvon (walking) would be coming his way from the left.
There are no other routes and Trayvon doesn't need to cut back ~ nor does George. They meet.
Another question is where George kept his gun. Does he wear his pistol going to Target on a rainy evening? Or does he keep it at home ~ explaining the pitstop and rapid exit from his truck. There are again only a couple of choices here. I vote for him keeping his gun at home, and picking it up to take out only in an emergency. Others may think it best to wear it all the time, even in a hard rain.
I"ll leave that up to the experts. Still, he had the gun with him when he met Trayvon on the sidewalk after, so to speak, "heading him off at the pass".