Claws. Each of your hands transforms into a claw, which you can use as a weapon if it's empty. It deals 1d6 slashing damage on a hit. Once on each of your turns when you attack with a claw using the Attack action, you can make one additional claw attack as part of the same action.
没有任何地方提到是“双手空置”,仅提到了若空置则可以作为武器使用,额外攻击的描述也不是“这对”而是“a claw”,希望修正译文以避免判定理解问题