Uchiha Sasuke could understand Naruto Uzumaki.
This was largely due to the teachings of the Fourth Hokage, Namikaze Minato, who was one of Sasuke's mentors and had shared much about the Jinchuriki with him.
Besides these…
There were other troublesome aspects.
For instance, the ability of the Tailed Beasts to provide Chakra to the Jinchuriki.
"Idiot..."
Uchiha Sasuke gazed at the figure clad in the Tailed Beast's shroud, feeling the difficulty of the situation as his own Chakra was nearly depleted.
Before leaving Konoha, Sasuke first defeated the Sound Four and had a bout with Orochimaru, which nearly exhausted his Chakra at the time...
Even though he had slightly recovered some Chakra while waiting at the Valley of the End, it wasn't enough to continue supporting him in battle...
However…
Naruto Uzumaki still had Chakra within him.
"Is my Chakra about to run out?"
Orochimaru seemed to notice Sasuke's predicament and chuckled as he spoke: "At this moment, you can activate the Curse Seal I bestowed upon you. Try out your new power..."
"Got it."
Uchiha Sasuke furrowed his brow.
Although he could use the Chakra from the Curse Seal, it would lead him into Orochimaru's trap, something others had warned him about in advance.
However…
If he didn't use the Curse Seal now…
It might arouse Orochimaru's suspicion, which wouldn't be favorable for his undercover mission.
Whatever.
After all, the Curse Seal will eventually be removed.
Sasuke decided to stop resisting the Curse Seal's invasion and invoked its power. The Chakra from the Curse Seal rapidly enveloped his body, burning his skin like flames and even altering his appearance!
The power of the Curse Seal…
Uchiha Sasuke had also received some secret information about it.
Since almost all the ninjas from Root had Curse Seals, although their seals were bestowed by Akihara Kagura, and the clansmen from Root occasionally mentioned training with the Curse Seals.
"Ahhhhhhhh!"
Uchiha Sasuke couldn't suppress his agony. He could feel something climbing out from within him, as the Curse Seal had already begun to completely transform his form!
A mass of fleshy claws emerged from his back, standing like wings behind him, and a piece of flesh armor materialized on his face!
"The second form of the Curse Seal..."
Orochimaru looked at Sasuke with some astonishment, a smile suddenly appearing at the corner of his mouth: "Truly a unique genius... Sasuke..."
"Rasengan!"
Naruto Uzumaki, clad in a crimson Tailed Beast cloak, had a purple Rasengan appear in his hand, distinctly different from the one he usually used!
"Chidori!"
In Sasuke's hand appeared a chirping silver light, different from the usual form of Chidori he used!
Uchiha Sasuke's eyes were locked onto Naruto Uzumaki, struggling against the Curse Seal's assault on his will; it was also a form of training for him...
Whether for him…
Or for Naruto…
This battle was a form of training.
"Naruto."
In his Curse Seal form, Uchiha Sasuke looked at the beastlike Naruto Uzumaki, gripping the electric light of Chidori in his hand, and said coldly: "Go back and train well, you're still far from it..."
"I'll definitely bring you back!"
In his One-tailed state, Naruto Uzumaki charged towards Sasuke, Rasengan in hand: "Even if it means dying, I will bring you back!"
"Idiot..."
Sasuke muttered an insult, raising the Chidori in his hand to meet the attack. He didn't care how much damage this would do to Naruto, knowing full well his regenerative abilities!
"Sasuke!"
"Naruto!"
Naruto Uzumaki's face was still filled with stubbornness!
Sasuke's face showed a hint of hesitation!
The two drastically transformed teenagers lifted their strongest jutsus, and charged directly at each other!
"Rasengan!"
Jiraiya lifted his hand, a Rasengan forming within it as he looked towards Orochimaru standing opposite, seemingly inviting a clash.
"..."
Orochimaru's expression turned peculiar.
Among the Sannin of Konoha, Jiraiya's Rasengan could only serve as an added jutsu in battle, hardly the decisive factor in determining victory.
Orochimaru's brow slightly furrowed, seemingly unable to comprehend Jiraiya's actions, as his fingers quickly formed hand seals!
"Lighting Release: Thunderous Roar!"
A burst of lightning suddenly struck Jiraiya!
"Aaaahhhhh..."
The Rasengan in Jiraiya's hand dissipated instantly as he swung his arm in pain: "You really have no sense of decency..."
"Idiot!"
Orochimaru sneered at Jiraiya, mocking his naivety and foolishness: "Do you think we are still adolescents?"
Just as the two of them were speaking, the outcome was already being decided on the battlefield's other side. Naruto Uzumaki and Sasuke's jutsus collided, immediately causing a massive explosion!
"This is bad!"
Orochimaru and Jiraiya's expressions changed simultaneously!
As the explosion began, the entire air of the Valley of the End started to tremble! The moment Chidori and Rasengan collided, it was as if a black hole had formed, only to explode suddenly, the canyon walls rapidly cracking, debris flying and falling continuously, and even the lake above the Valley of the End tilting and pouring down!