"A Dangerous Bridge" (危ない橋, Abunai Hashi, Viz: The Perilous Bridge) is chapter 340 of the original Naruto manga.
Naruto's shadow clones charge at Kakuzu. Team Asuma prepares to provide assistance, but Yamato warns them not to. While Kakuzu is busy with the shadow clones, Naruto tries to hit him with his new Rasenshuriken. It dissipates before it makes contact, forcing Kakashi and Yamato to save Naruto from Kakuzu's counterattack. Disappointed with Naruto's display, they offer to join him in fighting Kakuzu. Naruto asks for another chance, saying he will never be able to reach Sasuke if he always needs others' help.