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For me the main example of leg locks failing in MMA is Ilia Toporia's knockout of Ryan Hall in the UFC.

Also, many powerful leg locks entries fail to succeed in MMA, due to overcommitment of limbs.

There are also a large number of banned moves in MMA. Nothing is perfect. Grabbing someones foot/leg isn't a one and done deal, either way, because we do actually have two and they're pretty powerful.

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