The End of Tears

After activating Stage 2 of his Cursed Mark, Sasuke transforms into a winged equal to Naruto in power. Both remembering their time as teammates, Sasuke enlightens Naruto that they are in the "Final Valley" and mentions the irony of it as a fitting place to settle things between them once and for all. With Naruto and Sasuke at their peaks of power, the two prepare their final attacks: Naruto's Nine-Tails chakra infused Rasengan and Sasuke's Curse-Mark enhanced Chidori collide and forming a dome around the two before Sasuke stabs Naruto through the chest. With the last of his strength, Naruto leaves a deep scratch on Sasuke's headband. The dome disappears, and Sasuke stands over Naruto in victory. However, refusing to follow the same path as his brother (killing your best friend to unlock the Mangekyo Sharingan), and also remembering what Naruto means to him, Sasuke spares Naruto’s life and heads off to Orochimaru's hideout. Kakashi arrives soon after to see a knocked-out and injured Naruto, carrying him away while unaware that a mysterious member of the Akatsuki had watched the entire fight unfold from underground.