One Piece Chapter 39, page 3: FOR WHOM THE BELL TOLLS

Kuro attacks with blinding speed, his clawed gloves slicing through the air. Luffy is caught off guard by the sheer velocity of the strike, crying out "UUH!!!" and "AHHHH!" as he is forced to dodge and defend against the invisible onslaught. Kuro's deadly cat claws gleam as they slash wildly around Luffy.