The fireball did put the collision in Sasuke's favor. He felt the heat on his skin, and saw the Rasen Shuriken slowly closing in on Uzumaki Naruto. Blood and the scent of brunt flesh told Sasuke the Black Chidori hit its mark. Naruto's shirt was ripped open, and blood was seeping from a wound on his chest.
Sasuke knew that Naruto had no idea what true hatred was. True hatred fuels you, makes you stronger than before. It's a motivator that works until vengeance has come upon the one you hate. The tears streaming down Naruto's face were not of hate, but of anger and sorrow. Sasuke saw the look in his eyes though, the look of pure hatred of his opponent. Itachi had seen this look in Sasuke's eyes, the day Sasuke killed him.
The fight continued, and it didn't shift into either's favor for most of it. Eventually, the fight did shift in someone's favor. Around the time that it did, Sasuke's shirt was ripped clean off, and he was covered in cuts. Naruto had achieved Six Tails Manifested. Sasuke was tired of playing around and opened his eyes. "Susano'o!" Sasuke screeched! The large golem appeared and worked as Sasuke's protective shield.
It was as tall as Six Tails Manifested Naruto. Naruto lunged at Sasuke, but he swiped him away with Susano'o's fist. Naruto's eyes closed, and he fell to the ground. He was in a human state now, the chakra tails had returned to inside Naruto. Naruto opened his eyes, and found the Susano'o was gripped around him.
"Game over, Uzumaki Naruto!" Sasuke said as he had the Susano'o's grip tighten around Naruto's chest. Naruto's screams filled the air, and the bones in Naruto's arms and chest started to snap. Blood shot from his mouth. Then it all stopped.
"Am I dead?" Naruto said aloud once he landed on the ground. He opened his eyes when he received no answer. He wasn't dead. The Susano'o was gone, and Sasuke was ground. Then Naruto saw what stopped it all. Standing above Sasuke was a man. The man looked at Naruto revealing an orange mask. "Uchiha Madara! What are you doing here?" Naruto wheezed out. Blood oozed from his jaw, which was clearly broken.
"How dare you Sasuke? We had an agreement! I held off the Jonin, while you burnt the village! All I asked was for you to bring me the Nine-tails brat alive!" Madara scolded. Sasuke looked up, and a large grinned covered his bloody, and beaten face.
"I don't care about our agreement Madara!" Sasuke barked. He lifted his hand a lightning sparked, at the same moment Sasuke shot into the air yelling "Chidori-Lightning Blade!" It went straight through Madara. Sasuke smiled, satisfied with the kill. Then his smile faded, when he realized it went through causing no harm.
"Poor Sasuke, you never learn." Madara laughed. Madara punted Sasuke in the head, and Sasuke flew, blood was spurting from a now broken jaw. Sasuke didn't land on the ground, but into an even more painful punch into his back. More blood shot from his mouth, muffling his screams. "It seems the role of the teacher has fallen on my shoulder, yet again."
