One Piece Chapter 35, page 2-4: THE STEEP SLOPE AGAIN

Luffy cracks his knuckles, preparing for more action. Kuro slowly begins to rise, radiating an intense, terrifying anger. Jango and the Nyaban brothers tremble, realizing Kuro is furious. Sensing an opportunity while Kuro is down, the Usopp Pirates (Ninjin, Piiman, and Tamanegi) suddenly charge out of the bushes.

The three kids leap onto the fallen Kuro, screaming, "YOU INGRATE BUTLER!!" and "DIE, YOU BASTARD!!" They beat him relentlessly with their shovel, bat, and racket. Usopp and Kaya watch in absolute shock, with Usopp yelling at them to stop and asking how they even got there.

Usopp and Kaya scream at the kids to stop. Jango and Zoro look on, bewildered by the children's reckless actions. The kids finally stop, deciding to show Kuro "mercy," and turn to Usopp, demanding to know why he didn't tell them he was fighting. They argue over whether his secrecy was "disloyal" or "dishonest.