"You're strong. That will of yours even surprised me."
"But you're not in perfect condition right now."
"You should just concede this match."
"Don't worry. Nobody will laugh at you."
"Because all of us have seen how strong you are."
In his own way, Son Goku was expressing his highest respect for a warrior worthy of it.
However.
Upon hearing those words, Zoro slowly raised his head.
He tied that black bandanna around his head with the utmost care.
Then, in a hoarse yet utterly resolute voice, he slowly spoke.
"What you said might be right."
"But..."
"Scars on the back are a swordsman's shame."
His sharp, single eye remained fixed on Son Goku, burning with an unyielding flame fierce enough to ignite the soul itself!
"I, Roronoa Zoro, have never conceded since I set out to sea, whether I faced Hawkeye or Kaido."
"That word doesn't even exist in my dictionary!"
"I also know I can't defeat you."
"But!"
His aura climbed to its peak at that moment!
"As a swordsman challenging for the title of World's Strongest!"
"Please, let me see it too!"
"Just what the view is like at the true summit, above all the mighty!"
"I want to face you head-on for one exchange!"
"With my strongest sword strike, staking everything I have!"
As he listened to Zoro's declaration of challenge, filled with resolve.
The smile on Son Goku's face slowly faded.
In its place came an utterly earnest respect from the heart.
"...I understand."
He nodded.
"Your resolve has truly reached me."
"Then, in response..."
BOOM!!!!!!
A silver radiance erupted from Son Goku's body!
In an instant, he entered his strongest and final form!
[Perfected Ultra Instinct]!
"I'll also respond in my strongest form to this strongest sword strike of yours, with everything at stake!"