As the prosecution seems likely to tell it, Zimmerman pursued Martin, armed and intent on a confrontation with him. Martin, in turn, wanted to know what this unwarranted pursuit was about and to dissuade any repetition.
Then why does GZ call the police first?
GZ is asked to try to see where TM went, by the dispatcher.
TM has already gotten out of GZ’s sight at that point.
There’s no evidence at all of any pursuit, and plenty of evidence of a lack of pursuit.
There’s no evidence that GZ ever interfered with TM walking past him.
Nothing will come of any federal GJ proceedings except a waste of time and money, except this is probably just the regular GJ meeting, and therefore not really related to the TM case. They just happen to be trying to use it.