[joe fonebone]

He was following the thug, and when the 911 operator suggested he not do that, he stopped and was walking away when he was attacked. He was hit from behind, and that constitutes an aggressive assault.... the thug then pounced on top of him and commenced to beat him mercilessy, bashing his head into the cement... the only thing the thug did not take into account was that his victim (yes the victim here is zimmerman, not the thug) was armed. It looks like the thug picked the wrong guy to assault.

[SMARTY]

That’s the way I read it

[Oztrich Boy]

He was following the thug, and when the 911 operator suggested he not do that, he stopped and was walking away when he was attacked.

And this is the point Lt Columbo stops at the door and says "There's just one thing I don't understand"
Time period from exiting truck to "OK" to police operator ¼ minute
Time period from then to altercation, at least 2 minutes.
And Martin's body is 1-2 minutes distance away from Zimmerman's truck.