Meaning I gather, that just as a man has a hand and can make it into a fist, so the tiger had big teeth, but that did not mean he necessarily would use them to kill for food.
But grandma - what big teeth you have - said little red riding hood...by that sort of logic, the poisonous Gila monster is the most evil of all lizards and probably should be made to crawl upon it's belly like a snake.