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The cannon Shen shot during the battle actually seemed to cause an explosion that hit and weakened all of the masters, though Tigress possibly took more of the blast than the others considering that she shoved Po out of the way when Shen shot at him.

However, it seems unlikely that she was directly hit, considering Thundering Rhino was killed after a taking a blow from the cannon, and Po was severely injured after being shot as well, possibly only saved by his immense body fat and the fact that he shielded himself with a wok pan. Though Tigress may be numb to physical pain in her paws, it stands to reason that if she was directly hit, she mostly likely would have died.