The first thing to notice is that Gary has his weight on Victor. He is reaching around Victor's waist to pull him closer and put even more weight on him. At the same time, he has his left arm under Victor's arm
As he turns Victor, Gary pulls his right arm back and shoots it through underneath to grab Victor's bicep.
You can see below that Gary continues to crank on Victor's neck with his left hand as he pulls the opponent's arm in toward him with his right. Notice how his weight is STILL all pushing against Victor. There is no space between the two of them. Also, you can see in both photos that Gary is driving against Victor with all his weight. Notice how he is pushing off of his left leg.
Now I know that anyone who ever wrestled learned a half-nelson and I see lots of judo players who are successful wrestlers get in the same position that Gary was above and they never try this move. It is just ridiculous. Cut it out! Do a half-nelson, damn it!