One Piece Chapter 29, page 7: Slopes

Nami asks where Luffy is, and Usopp explains that Luffy ran ahead so fast he lost sight of him. They realize Luffy must have gotten lost. Usopp tells Nami to charge ahead while he covers her, but Nami refuses, pointing out that she is weak too. Usopp admits he is shaking in fear and can't even move his legs, though Nami suspects he's lying. Meanwhile, the pirates are ignoring them and talking amongst themselves.