You can read Naruto 620 at this online best manga site. Here is the summary of Naruto chapter 620: As Sasuke boldly declares that Hashirama's response would decide whether or not he should take revenge on Konohagakure, Tobirama, who had become angered at this sentiment, notes that he would not allow such a thing to happen. In a fierce exchange of silent wills, which sends those around them into near-frenzied panic and begins to destroy the Naka Shrine, Tobirama finally adheres to his brother's command and lowers his fingers from around the bands on his arms. Reverting almost immediately to his jovial, carefree self as Hiruzen breathed a sigh of relief and Minato marvelled, Hashirama praises Itachi, telling Sasuke that Itachi was a better shinobi than himself, and that he will happily tell the lengthy answer to the question he had posed to him. Telling him to make it as short as possible as they were strapped for time with a war going on, Hiruzen tells Orochimaru that if it were a case where Madara was currently on the battlefield then they needed to head out as well. With Minato and Tobirama sensing the situation on the battlefield and confirming it to be true, Minato is glad that his son was able to achieve what he had wanted him to do when he sealed the beast into him. Tobirama, however, discards Orochimaru's threat to bind them entirely and declares that he was going to the battlefield. However, thanks to now acquiring Hashirama's genetic material, the binding of the Impure World Reincarnation had become more powerful as Hashirama noted, telling his brother that he had grown dull. Easily breaking free of the additional restraint as Orochimaru noted, Hashirama allays the Sannin's fears, telling him that first he would free Sasuke of the darkness that surrounded him before he became another Madara and casually takes a seat on the ground and begins the retelling of the story of his confrontation with Madara at the Valley of the End and the history of the Senju and Uchiha.
