That wasn’t remotely comparable to a rear naked choke or a choke where a garment is used to apply it. There is no way an effective choke could be done with his hand in that position without applying significant backwards pressure and at the same time using your body to prevent the individual from moving backwards. I’ve done thousands of chokes and they all require some counteracting force. On the ground two hands on the neck with the ground being the counteracting force. The same again a wall with the wall being the counteracting force. A rear naked choke one arm applying backwards or side pressure with the other arm applying forward or opposite side pressure. There are numerous ways to apply a choke but they all require counteracting forces working together.Many guys get their clocks cleaned or even worse pretending to be these MMA fighters doing a rear naked choke.