A real fight is different from training. He was very Lax with that choke In general. It wasnt on very tight at all. He was either already gassing from an adrenaline dump or didnt really want to strangle that boy so he just opted for slamming his head into the ground.
But i'll tell you friend, for the street we arent trained to put hooks in from standing. Ideally you put your chest on your opponents back put your lead leg forward your other leg back, your head to the side and pull him backwards bringing your back leg to the ground. He will basically choke himself out with his own body weight while you squeeze daylight out of his vision.