With the Nine-Tails' help, Sasuke immediately felt that his power far surpassed what he had possessed when he and Naruto fought Aoyun in the Land of the Moon. He was confident he could defeat the man before him, but the Nine-Tails stopped him before he could act.
Sasuke asked in confusion, "Kurama, why are you stopping me?"
The Nine-Tails replied, "Brat of the Uchiha Clan, don't tell me you think this is enough to handle that guy?"
Sasuke frowned. "What do you mean?"
The Nine-Tails replied, "Hmph. Don't act rashly before you fully understand your opponent's strength, or you'll pay dearly for it. Test him first. I'll help you refine natural chakra. Only natural chakra can deal with this guy."
Sasuke frowned, seeming to ponder the Nine-Tails' words. Just then, Kakashi asked, "Nine-Tails, how do you know that only natural chakra can deal with him?"
The Nine-Tails said disdainfully, "Hmph. Who do you think I am? I'm the strongest of the Nine Tailed Beasts, the nine-tailed demon fox. Besides, I obtained the Celestial Fox Secret Manual, along with the body of that Nine-Tailed Celestial Fox in the cave in the Land of the Moon. Now I have the potential to surpass even the Ten-Tails. I can tell just by sensing him that ordinary chakra from this world won't work against him. Only high-level chakra like senjutsu chakra can hurt him. Using ordinary chakra against him would be like throwing meat buns to a dog-you'd never get them back. He'd simply absorb it."
Kakashi sounded a little doubtful. "Is that so?"
Seeing Kakashi question his judgment, the Nine-Tails immediately grew displeased. "Hmph. Foolish human, I have no reason to lie to you. If you weren't that little brat Naruto's teacher, I could kill you right now just for daring to question