Shihōin Naraku certainly thought Infinite Tsukuyomi was terrible, nothing but a farce.
Madara Uchiha thought all the ninja trapped in dreams could have the best possible ending, but in reality, given enough time, the ninja would all turn into White Zetsu.
Of course, Madara did not know this truth.
So he had always believed he had indeed done the right thing.
Looking at Madara, whose entire body radiated an overwhelming presence as he stood ready to attack at any moment, Naraku watched him without betraying anything.
It was time for Black Zetsu to act, too.
Otherwise, once the battle began, it would be difficult for him to stab Madara in the back.
Just as Naraku thought this, a wet squelch rang out, and Black Zetsu, who had attached himself to Madara, quietly moved.
Squelch!
In an instant, a pitch-black arm pierced Madara's chest!
The sudden turn of events stunned everyone present, though Naraku was merely playing along.
"Wh-what's going on?"
"I... Black Zetsu, you..."
His body frozen in place by Black Zetsu's sudden sneak attack, Madara wore a look of disbelief, unable to move.
Madara's pupils abruptly contracted in agony and shock. He lowered his head to look at the twisted, pitch-black arm protruding from his chest.
"Black Zetsu... you..." For the first time, Madara's voice trembled. Gone was the indifference of someone who controlled everything, replaced by a low growl mingled with bewilderment and fury. "My will... my creation... why...?"
"You bastard... Black Zetsu, why did you betray me?"
"Why did you betray your master? You were born from my consciousness!"
Faced with Madara's demands, Black Zetsu sneered. "Your consciousness?"
Black Zetsu's distinctive, sinister voice sounded right against Madara's back, carrying a mockery that had been suppressed for a thousand years and could finally be released. "Madara, you're wrong.