One Piece Chapter 32, page 11: Grave Danger

Watching the struggle, Nami worries, "OH NO! ZORO CAN'T HANDLE THEM!" Usopp decides to intervene, saying, "HE CAN'T COUNTER WITH TWO PEOPLE ATTACKING HIM!! I'M GOING TO HELP HIM!" Nami tries to stop him, asking, "WHAT ARE YOU DOING?!" but Usopp fires his slingshot anyway, shouting, "EAT THIS! 'NAMARII-BOSHI'!!" (Lead Star) toward the combatants.