The blood in Hidan's hand was naturally left behind from Obito's previous intrusion into the Northern Lands. Although some time had passed and the effect wasn't as potent as fresh blood, it was still more than enough to handle the current situation. Even with Obito standing right in front of him, he was going to suffer!
A trace of confusion had just surfaced in Obito's single exposed eye when, the next instant, he spat out a large mouthful of fresh blood.
The blood was mixed with fragments of his internal organs, staining the inside of his mask red.
Chapter 354