That was one of the Uchiha Clan's most powerful secret techniques. In a sense, it was also the ultimate defensive technique: Izanagi! As long as he had this technique and carried a few Sharingan with him, Obito couldn't be killed easily. In the original story, when he fought Konan, even after his Kamui had been countered, he survived Konan's explosive attack—an attack so "magnificent" it was unmatched—thanks to Izanagi, a technique that truly turned the illusion of life and death on its head.
In other words, even if Karin really managed to restrain Obito,
and Naruto dealt him another devastating blow,
the most it would cost Obito was one Sharingan.
Besides, Obito could still use Wood Release. He was only a dabbler, and compared with the First, what he used couldn't even be called Wood Release. But under certain conditions, it could still prove highly effective.
In short,
Obito had underestimated Naruto this time. He would pay a steep price, but he would still escape with his life.
Still, for Obito personally, it was a tremendous humiliation.
"Minato Naruto, Uzumaki Karin, Sasuke Uchiha. We'll have to be careful with our plans from now on. They don't seem as easy to deal with as we thought."
Black Zetsu still wore a gloomy expression as he spoke in a sinister tone.
"I understand! I won't make the same mistake twice! The plan will still go ahead as usual, but we'll need to make some changes. Since Sasuke Uchiha has already killed Orochimaru, he'll definitely go after Uchiha Itachi next. He's a very important piece, too, so I'll monitor him personally! Zetsu, bring out those things! The Three-Tails and Six-Tails will probably be difficult to capture directly, but we must seal the remaining Tailed Beasts inside the Demonic Statue of the Outer Path