Here's what I think happened...
GZ saw TM taking shelter from the rain and then walking eastbound toward the row of homes. GZ honestly thinks he looks suspicious and is up to no good. He calls 911. TM continues walking eastbound toward GZ's car, because that's the way he has to walk to get home. That's when GZ says "he's coming right at me." TM passes and now that he has safely passed GZ and his car, TM starts to pick up speed cause he doesn't like the way GZ has eyed him. They've actually eyed each other. GZ tells the dispatcher TM is running. That's also when TM tells his girlfriend he is being followed. TM gets up onto the sidewalk, still heading east, and makes the southward (right) turn behind the buildings. At this point, GZ is out of the car and himself picking up speed and telling the dispatcher these guys always get away, I think I lost him, have the officer call me when he gets here. GZ gets off the phone. TM remains on the phone with his girl and says to her, as attorney Crump says, I think I lost him. TM is now behind the homes just steps from where he will die, continuing to head south. GZ himself makes the turn south and once again has TM is sight and resumes following him, and now GZ is more convinced than ever that TM is up to no good and should not be allowed to get away. And GZ knows the police will be there soon. GZ is behind TM. Both are moving south. TM turns around and says, "Why are you following me"? GZ then grabs TM. That's when TM's headset falls off, and his GF hears a scuffle, which she has sworn to. In a matter of seconds, the two will be in a life and death struggle. Each thinks the other is the bad guy. GZ shouts for help. The struggle gets even more intense. The gun comes out. Now they are fighting for the gun -- past the point where either of them can defuse the situation. TM cries out for help because he knows it's only going to be so long that he can keep the gun pointed away from him. Four hands are on the gun, the neighbors' calls to 911 are made, the shot goes off and the screaming stops. TM is dead.
I do think this is the likeliest scenario. I think GZ recklessly instigated by being there in the first place, pulled his gun when they scuffled, TM freaked and ran, GZ pushed him from behind, he went down face first with arms under due to trying to break his fall, GZ straddled him and shot him.
I'm so beyond ready for a release of known facts in the investigation. I just want to know what happened. I'm not wanting to lynch anybody, I just want to know what happened.