Grasshopper Guard Shoulder Crank
Ok, who's tried this: You've countered a dump pass by weighing heavy and dropping your hips way to the ground, then hooking under his thighs with his arms now trapped by your legs. Grasshopper Guard.
Sure you could push his head through and past your groin then scramble over to the back, or collar choke his now isolated head. But why be practical when you can be a prick?
Get a grip on one of his sleeves under his wrist then push his wrist backwards. His forearm flares outward and back towards his feet, his elbow rotates inward on this axis. Does anybody understand me?