Sasuke had learned far too much at once, and the information shattered everything he had always believed. Or rather, it told him that the spiritual pillar he had relied on to keep going was false, that he had spent all this time hating someone he should never have hated. Such a distortion was enough to drive any normal person mad, let alone an Uchiha, a clan notorious for mental instability.
If Sasuke were left alone, he would absolutely trap himself in that dead end. He would either feel that he had wronged Itachi and, having lost his reason to live, kill himself or become a complete layabout, or decide that Konoha and Danzo were to blame for every tragedy in his life and therefore destroy Konoha! Or, more extremely, destroy the world outright!
Fortunately, however, Sasuke was not alone at the moment (why did that sound like an insult? Haha). With him were the companions he had more or less accepted, though he had stubbornly refused to say so, as well as his teacher. There was also a powerful man who carried weight in his heart: Su Yu.
So, although the little black flames behind Sasuke had already begun to rise, they were ultimately doomed to be extinguished.
Naruto was usually rather slow on the uptake, but at a time like this, he was actually the first to speak.
"Sasuke! What's gotten into you?!"
Naruto's sudden shout not only startled Sakura and Kakashi, but also made the little black flames burning around Sasuke pause.
Naruto said, "I don't know how you used to feel about that guy called Itachi, but from those visions just now, he's always cared about you, hasn't he?! He loves you so much, just as much as he loves Konoha! He didn't do all this for