Depends where he was parked. From his call it sounds as if he is close to the clubhouse, and that is perhaps where he parked and got out. If so, unless he was an olympic athlete he must have continued his pursuit after hanging up the phone.
No matter how you measure it, it seems impossible that in the ten seconds or so he was running, that he made it all the way from the general area of the clubhouse, past the corner of the building, then PAST TM, before turning back towards his vehicle (where, according to some claims) he was allegedly ambushed.
In my opinion.
Again in my opinion, he called while running, stopped when LE asked him to (you can hear this) then after he hung up he went back to pursuing TM, finally catching him on the back walk.
I suspect that TM saw him coming and tried to get away, dodging off the sidewalk and onto the grass, probably pleeding for help as he went. I wouldn't be surprised (speculation) if GZ didn't slip on the wet grass, probably red-lining his rage even more. THIS one wasn't gonna get away.
Further, I think there was no real fight. There was far too much pleading for that. Fighting is exhausting. In my opinion this was essentially an execution. I think, mmo, that GZ pulled his gun, cornered TM, TM was begging for his life, GZ decided to kill him, GZ yelled for help once and shot him.
In my opinion of course.