Zabuza And Haku

After a quick defeat of Zabuza's water clones at the hands of Sasuke, Zabuza and a masked Haku revealed themselves, confirming Kakashi's suspicions. 

Back at Tazuna's house, two of Gatō's thugs arrived to kidnap Inari's mother. Inari, inspired by Naruto's story, attempted to save his mother by himself. Just as he was about to be cut down by the thugs, Naruto appeared and defeated the two single-handedly.

Naruto congratulated Inari for finally standing up for himself, and left to join the rest of his team.

Back at the bridge, Sasuke battled with Haku, and Zabuza was surprised to find that Sasuke could keep up with Haku's speed. Haku, also noticing Sasuke's capabilities, decided to use his trump card, Demonic Mirroring Ice Crystals, which trapped Sasuke in a cage of ice. 

Haku proceeded to pummel Sasuke with wave after wave of senbon barrages, which were made effectively undodgeable as a result of Haku's technique. Eventually, Naruto arrived and managed a sneak attack on Haku. Just as Zabuza was about to attack Naruto, Haku asked to be the one to fight him, to which Zabuza agreed.

Sasuke began to formulate a plan, thinking that it would be easier to defeat Haku with Naruto attacking from the outside. To his dismay, Naruto entered the cage of ice to see how Sasuke was doing, and he too became a prisoner of Haku's technique.

Naruto and Sasuke both attempted to destroy the ice mirrors, but were unsuccessful. This turn of events led Kakashi to believe that Haku was using a kekkei genkai, and that Naruto and Sasuke had no chance of winning.

Because of this, he once again revealed his Sharingan, expressing his desire to finish the battle quickly. Zabuza explained that he had learned how to defeat the Sharingan, and disappeared into the mist. As Kakashi instructed Sakura to guard Tazuna, Zabuza struck, revealing to Kakashi that Zabuza was now attacking with his eyes closed, making the Sharingan's ocular genjutsu useless.

Zabuza, explaining that was specialty is killing people based purely on sound, attempted to finish off Tazuna, but Kakashi made himself into a human shield at the last second. Heavily injured, Kakashi resorted to using an attack that he himself had created.

Meanwhile, the fight between Haku and Naruto and Sasuke continued, with the two genin having sustained heavy wounds.

Haku, noticing this, attempted to attack an exhausted Naruto instead, but Sasuke managed to pull Naruto out of way. A shocked Haku noticed Sasuke's eyes, and it was revealed that, as a member of the Uchiha clan, Sasuke the Sharingan, which enabled him to see Haku's movements with ease. Haku, fearing for his success at winning the battle, goes for a finishing blow upon Naruto, but Sasuke rushes to Naruto's side to stop the attack with his own body.

When Naruto awakened from his faint, he found a severely wounded Sasuke standing over him. When Naruto asked why Sasuke had saved him, he replied that it was merely instinct, and fell into Naruto's arms. After admitting that he had promised not to die before killing his brother, Sasuke fell unconscious, and Haku asked Naruto whether it was the first time he had witnessed death.

Naruto, enraged by the apparent loss of Sasuke, began to emit a visible chakra, and Haku noted that it was pure evil. As the chakra poured out, Naruto's wounds began to heal, and he acquired claws, fangs, and slitted pupils. Zabuza and Kakashi both sensed this new chakra, and each initially wondered whether it belonged to the other jōnin, but Zabuza noted that the chakra was far too powerful to belong to Kakashi, and Kakashi was able to recognise it as that of the Nine-Tailed Fox. Kakashi, worried that the seal keeping the nine-tailed fox within Naruto would break soon, decided to pull out all of the stops, and drew a scroll, smeared his blood on it, and told Zabuza that they should now end the battle.

A transformed Naruto began to attack Haku, who attempted to counter with a barrage of needles, which were easily repelled by Naruto's roar. Haku attempted a physical attack, but Naruto was able to dodge it and grab the now fleeing Haku in an instant. 

After releasing a large amount of chakra, Naruto gave Haku a deafening punch in the face, sending him flying through a nearby mirror and destroying all the other mirrors as a result. Once Haku's body came to a stop, he rose, and Naruto charged at him so that he could give the finishing blow. As he did so, Haku's mask began to crack and break away, revealing the face of the boy whom Naruto had met in the woods. 

Mere inches from Haku's face, Naruto stopped his attack and returned to his normal form. Haku questioned why Naruto is sparing him, only to receive a weak punch to the face. Haku explained that with his defeat had come his uselessness to Zabuza, and that, because he could no longer protect Zabuza, his most precious person, he should die. Naruto didn't understand this reason for wanting death, but Haku began to plead for it nonetheless.