Better than a Shuck
This is a similar motion to a shuck, he wants to keep his shoulder as high as possible. When your opponent is clinging on to your arm turn your body so your hips are facing the same direction and lift your arm high so he won't be able to hold on anymore. At this time it's important to use your opposite hand to slide behind his arm and block it, then quickly attack the far hip with that arm attack him down to his hip. This has to be one hard fast explosive movement.