The fundamentals of this technique

Two men are in a room with a white wall and a desk with various items. The man on the left, wearing a long-sleeved shirt, starts in a fighting stance and then turns to face the man on the right. The man on the right, wearing a short-sleeved shirt, extends his right hand towards the other man, who then turns and grabs him in a martial arts hold, pulling him forward and down. The man on the right reacts by bending over and then looks up at the man holding him.