It might, with certain facts to back it up, be considered harassment, but following him is certainly not the use of force.
Zimmerman did something that TM didn't like, felt intimidated or threatened by, or was otherwise uncomfortable with - even if we believe Zimmerman's account. Perhaps it was criminal behavior on GZ's part - but it was not force and did not call for retaliatory use of, or justify the defensive use of force, by TM.
But Zimmerman does not appear to be the one who crossed the line into the use of physical force.
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