1) All this occurred on a basically public sidewalk.
2) One a resident, the other a guest, both had a "right" to be there..especially the resident/neighborhood watch.
3) Technically, one can follow the other so long as physical contact is not made.
4) Tragically, apparently Z did not identify himself as neighborhood watch, nor did TM ask why he was being followed.
5) It APPEARS the act of "following" was abandoned BEFORE the physical contact was made.
6) Whether or not that is the case, whoever made FIRST physical contact bears a great deal of the blame.
7) As I related earlier, I often patrol on neighborhood watch. As a leader, I insist that we remember we are 'watch dogs', NOT 'attack dogs'. We also wear special baseball caps with a large, reflective NW on the front.
I should be allowed to follow anyone... at a respectful, observable distance, It is one of the methods of deterrence. Any of them would have the same right to follow me in a public venue... and one should be allowed to ask the other if/why they are being followed.
9) Tragically, a simple inquiry could have saved the whole situation. Perhaps the NW on the cap could have been instrumental, especially if such caps were already known as the Neighborhood Watch cap.
10) The situation still boils down to... Who made the bold, aggressive move to initiate PHYSICAL contact ?
11) From what we have to observe , it appears that the picture is clarifying. Not convincing yet, but surely getting there.