Spoiler-Safe Summary

safe read

Naruto and Sasuke suffer serious injuries in a fierce fight, prompting Sasuke to awaken a powerful clan ability. Misunderstandings arise during the battle, leading Naruto to tap into a deeper source of strength to continue the fight against their opponent.

Full Plot Summary

spoilers

Naruto and Sasuke are both injured severely from Haku's Crystal Ice Mirrors before the latter reveals his Uchiha lineage by awakening his clan's own inherit ability: the Sharingan. With Sasuke's Sharingan allowing him to track Haku's incredibly fast movements, he is deemed a bigger threat than Naruto and a volley of senbon is used to force Sasuke to take a hit meant for his teammate. Believing his teammate had died in his arms, Naruto is enraged and unconsciously taps into the Nine-Tails' chakra to heal his wounds while attacking Haku.