One Piece Chapter 32, page 13: Grave Danger

With Zoro's guard broken, Sham and Buchi slash him across the back. Zoro screams, "UWAHH!!!" and falls heavily to the ground, bleeding. Usopp is horrified, crying, "NO... NO...!! HOW COULD YOU HIT HIM!?" Nami, however, realizes the truth, explaining, "HE DELIBERATELY BLOCKED IT WITH HIS BODY...!!" Usopp is stunned, stammering, "HE DID THAT...?!"