I believe that he knew he was not to intervene or attempt to make contact with someone he was watching.
But I also believe that once someone disappears from view, they cannot be *watched* any longer.
If GZ's only intention was to position himself so he could continue to watch - to move past a building so that the sidewalk down which TM had turned would be in full view - then I do not believe he could be characterized as 'looking for trouble.' I think he was just looking for the *whereabouts* of TM, not looking to have any exchange with him, verbal, physical, or otherwise.
GZ's past behavior as a NW person is surely relevant, and unless I am mistaken, in the 40+ calls he made previously, he didn't ever attempt contact with a suspicious person.
Last year on a Sunday night, we had a house full of teenagers. As they were leaving, some standing right inside the front door, some out in the yard, suddenly in their midst was an Hispanic man, mid 20's, with a sports drink bottle in his hand that had orange duct tape all around it. He waked into our home. The visiting teens thought he was our neighbor. My own three teens momentarily thought he was somebody the other kids knew, but quickly figured out he was a stranger, and he seemed to be on drugs. He was very confused and had trouble opening our door to leave. There were no adults present - my husband had gone to bed, and I had run some books down to the book drop at the library.
When I returned, the man had already left, as had our kids' friends... and my three were pretty freaked out. "Mom, there was this guy, and we think he was on drugs, and he was in our HOUSE and we didn't know what to do to get him to leave and you and dad weren't here (they didn't know their dad was home in bed with a headache - they thought he was golfing) and...!"
I called the police. I turned out the lights in our house and sat in my dining room watching out the window. The police came and talked to the kids, etc..
The police began to patrol our neighborhood. I had one errand I had to run (it was about 10:00 PM). I locked the doors and left the house in our car, which was in our attached garage, putting the door down as I pulled out.
When I pulled back up to our house not five minutes later (small town - quick errands!
) a man fitting the description my teens had given me was in my driveway. I had already hit the button to put the door up as I was approaching and he began running into my garage. I pulled into the drive, shined my lights on him, and he took off running down the street towards a corner.
And you'd better believe I followed him from a distance, even around a corner, so I could see where he was going. I had NO intentions of getting near him or speaking to him, but I knew the police were near and I wanted to be able to point and say, "THAT HOUSE! HE'S BEHIND THAT HOUSE!!"
As it turned out, the man was mentally retarded, and had escaped from a group home.
I only tell 'my' story because it's an example of what can go through the mind of someone who is concerned about a stranger in their own neighborhood and who wants to WATCH that stranger - whatever it takes - until the police arrive. Not talk to. Not approach. Not encounter. Just *watch*.
And I do believe that is what GZ was attempting to do when he walked in the direction TM had gone. Not to talk to, encounter, or approach, but to *watch*. From afar. Until the police arrived.