Naruto Episode 1.18 The Weapons Known as Shinobi

Haku tells the hesitant Naruto to finish him off. Naruto strongly questions Haku's philosophy that his sole purpose for existence is to fight and win. He questions it, even if he understands deep inside that it was the "way of a ninja"... Meanwhile, the battle between Kakashi and Zabuza approaches the climax. Zabuza's movement is restrained by Kakashi's Summoning jutsu. With victory within his grasp, Kakashi unleashes his most devastating maneuver, Lightning Blade, against Zabuza. At the last moment, a body protects Zabuza and it is none other than the injured Haku.