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Po's advantage in the battle was ultimately his knowledge/ use of the Wuxi Finger Hold, and owed to him being unaffected by Tai Lung's immobilizing nerve attack, which allowed him to fight off the snow leopard until he was exhausted, after which Po captured him in the hold and performed the move. It's likely that Tai Lung was unable to block/ escape from the Wuxi Finger Hold, as he didn't even attempt to do so.