Like ink-black energy spurted from Danzo's chest. This black energy wasn't Chakra, and it carried a very ominous feeling.
The ink-black energy splashed around, with most of Obito's body submerged in the stone bridge. As for Sasuke, he had been advancing slowly toward Danzo. Upon hearing Obito's shout, Sasuke wanted to retreat too, but he was too close to Danzo, and having spent over 90% of his stamina from the earlier battle, escaping the range of the sealing skill by sheer speed was nearly impossible.
At the center of the sealing skill, Danzo tilted his head back, undergoing unimaginable pain, a feeling as if his soul were being torn apart.
The so-called Inner Four Symbols Sealing Technique was almost a kamikaze sealing skill because once used, the caster would die regardless of their state. The technique's definition was to seal everything around into the caster's body.
