The double under pass can be defended a few different ways:
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the combatant being double under passed can make their upper body ridgid and lengthen their body to make it difficult for their opponent to fold them over.
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They can also apply downward and outward force with the back of their legs, preventing their opponent from grasping their hands together, or breaking this grip if it has already been established.
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If unable to break this grip, the combatant being stacked can cut an angle and attempt to get one or two butterfly hooks in. These hooks can be used to press against their opponent and break the grip.
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The opponent being stacked can create a frame by placing their hands on their opponent’s hands, flaring out their own elbow, and placing it on the mat. This makes it hard to get stacked and can provide space to back roll out of the guard pass.
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The opponent being stacked can get clamshell grips on the stacker’s sleeve cuffs, then allow the pass to happen. As the opponent advances the double under pass, stiff arm with the arm on the opposite side that the legs are being forced, and hip out.
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The opponent being stacked can accept the stack pass, offering little to no resistance. Their opponent may get overzealous with the pass and do it sloppily. If they do, push off with the back of the hamstring against the opponent’s shoulder and back roll. Stay lower than the opponent’s head and blast double them from the turtle position.