Before him stood an Uchiha ancestor who resembled him, demanding in the name of the Uchiha that he reveal his Sharingan.
But the Sharingan he took such pride in was suppressed by the White Cursed Seal and could not yet be unleashed.
What a bitter predicament!
However.
The misery of his previous life had freed Sasuke from his fixation on the Uchiha name!
In this life, he would ultimately take on the Ōtsutsuki name he despised!
And so... before Izuna, he calmly revealed his "Byakugan"!
Izuna's shock and fury were all too predictable. "A Senju body, the Hyuga's Byakugan... have you forsaken the Uchiha name?!"
Sasuke said calmly, "I haven't forsaken the Uchiha. I simply refuse to be bound by that name anymore."
Izuna flew into a rage. "Utter nonsense! This is betrayal!! A betrayal of your blood!"
Sizzle! His eyes shifted into their Mangekyo form... a moment later, an eerie purplish-red skeleton formed beside him, raised its fist, and slammed it down at the traitor before his eyes!
—Susanoo!
Boom!! A deep violet glow blazed around Sasuke, blocking Izuna's incoming fist!!!!
The sight shocked everyone watching the battle from Blue Moon Island through the Telescope Technique!
Suigetsu said, "What? Sasuke can use that move with the Byakugan too...!?"
Orochimaru smiled. "It has nothing to do with which eyes he uses. Susanoo is a special power. From the moment it awakens, it resides within the person who awakened it. Using it is that person's privilege. However, while the Sharingan's power lies dormant, he can only use its initial Skeleton form..."
Suigetsu put it delicately. "Uh... just the skeleton? Its defense leaves a lot to be desired. Not to brag, but even I could break it if I put my mind to it!"
Orochimaru said, "That may no longer be true."