Obito's eyes had gone blind. He could only perceive the world by listening.
When he heard Black Zetsu's scream, his mind went blank. Why would Naruto attack him? Wasn't he just an ordinary manifestation of Madara's will?
Naruto ignored Obito for the moment. He walked straight up to the Ten-Tails and looked up at the giant creature as it stretched its limbs.
"Karin!"
At Naruto's sharp call, Karin understood at once. Dozens of Adamantine Sealing Chains shot from her back and bound the Ten-Tails tight.
The Ten-Tails roared and struggled to break free, but it was severely weakened, while Karin had an enormous amount of Chakra.
Its struggle was futile.
Naruto leaped onto the Ten-Tails' head. As he gazed at its single Six-Tomoe Rinnegan, greed flashed in his eyes.
From the start, he had gone to great lengths to leave Akatsuki some Tailed Beast Chakra so they could summon the Ten-Tails again. All for this moment.
He wanted the Ten-Tails' Six-Tomoe Rinnegan!
The original story had never shown exactly what this eye could do.
But Sasuke's purple Six-Tomoe Rinnegan had four formidable powers: Amenotejikara, the Space-Time Portal, Chibaku Tensei, and exceptionally powerful Genjutsu.
Naruto even thought it was more useful than Kaguya's Nine-Tomoe Rinnegan—the Rinne Sharingan!
In the original story, the Nine-Tomoe Rinnegan had displayed only two abilities: Infinite Tsukuyomi and Amenominaka. Amenominaka was also a powerful domain-type Spell Art.
But Naruto didn't like it, nor did he think it was as useful as Amenotejikara or the Space-Time Portal.
Since Naruto had no desire to obtain the Rinne Sharingan, he had no intention of letting Kaguya appear. The Ten-Tails as it was now would suffice.
The Ten-Tails was still in its first stage, weak but already possessing a Six-Tomoe Rinnegan. That made it easy for him to obtain the eye.