From Stage 1 of the Guard, they decide to post their hands on the ground to get up. At that point, you ride with them for a moment, then you release, post on your foot and elbow, reach over, grab your own wrist and at the same time grab their wrist with your other hand.
Push off of your feet to lie down, and that will bring them down.
Then put your foot in between their legs for a brief leg trap, and scoot your hips and shoulders to make you sideways. Once you are there, crank their arm to the floor, or until they tap. Keep their elbow in close to your chest.
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