Then TM had to be pretty fast if he managed to circle the Earth in a few minutes, running barefoot across two oceans, and stumble upon GZ again.
Or TM, a football player, would have to be slower than a garden snail if a fat, short, in poor shape GZ was able to catch up with him without ever running. He was on the phone for most of that time, and he'd be unable to hide that he is running - he'd be short of breath within ten yards.
If you don't accept these two impossible scenarios, then whatever remains, however improbable, must be the truth. And that means TM hid, then circled back and confronted GZ. There are trash cans and partitions behind houses, as seen in the walkthrough video; you could hide a small army there.