Had a coach that always said “control the hips control the match”. One of my teammates would add “but control the balls control the man”. Needless to say he’d grab your sac if you stalled, if he needed you to lift your hips, make you let go of a a leg…pretty much any reason. Some guys would try for revenge but he gave a lot more than he got.
But the armbar with a sac on your face is a good way to put your opponent back in his place.
