User blog comment:D.Dragon123/What we DON'T like about One Piece./@comment-4899461-20130110000749/@comment-4899461-20130110172120

Just because she cannot take injuries from the strongest characters in the series, it does not mean that she can't be given serious injuries from other weaker characters. Those injuries may not be as bad as Zoro's, but she can certainly have wounds that are as bad for her as Zoro's are for him.

PS: Zoro isn't the first mate.