Seeing another firebird appear, Sasuke rapidly formed hand seals. "Lightning Release: Chidori Stream!" A bolt of lightning shot from his hand, piercing the firebird like a sharp sword. Then he raised his hand and sliced the firebird in half.
When Sasuke unleashed his Lightning Release, Naruto noticed several more lines begin to fluctuate. They stirred as Sasuke's ninjutsu appeared and stopped once it ended.
At last, Naruto reached a conclusion. He now knew what those lines were, but he decided to test his theory again rather than risk getting it wrong.
Naruto held out one hand. "Rasengan!" Immediately, he saw all the lines begin to fluctuate. They continuously flowed into his Rasengan, and every line around it stirred.
After dispersing the Rasengan, Naruto held out his hand again. This time, he also entered Nine-Tails Mode. As the mode activated, two different kinds of lines fluctuated around him. The discovery intrigued him, but this was no time to indulge his curiosity.
A Rasengan began forming in Naruto's outstretched hand again, but this time it was no ordinary Rasengan. "Wind Release: Rasenshuriken!" he called out. This time, only one kind of line began to fluctuate. The others remained still.
Naruto dispersed the Rasenshuriken. He now knew what those lines were.
Seeing Naruto use a Rasengan, enter Nine-Tails Mode, then form and disperse a Rasenshuriken, Sasuke knew he must have discovered something. He had been watching Naruto's expression the whole time, and when Naruto looked relaxed and pleased with himself, Sasuke knew he had figured it out.
He asked curiously, "Well, Naruto? Did you discover something?"
Naruto nodded. "Yeah, I found something. I finally know what these lines are. Now I'm confident I can find a way out."
"Really? You already know where the exit is?" Sasuke asked in delighted surprise. He could