"Zephyr-sensei… are you alright?"
Kai glanced once at his Armament-coated right arm, then looked toward Zephyr's stiff, almost petrified face.
With Armament Haki active, he could feel it clearly—
A terrifying destructive potential, like a dormant volcano, slumbered inside his fist.
Iron Body?
He no longer needed it.
Compared to Armament Haki—
Tekkai was completely obsolete.
Slowly—
Zephyr came back to himself.
He lifted his head and stared at Kai with an expression that was hard to describe in words.
"One day…"
"Both Observation and Armament Haki…"
"And fully mastered from scratch."
"What kind of concept is that supposed to be…?"
His voice trembled faintly.
In all his years of teaching—
Something like this had never happened.
Not once.
If he hadn't witnessed every step with his own eyes, he would never, ever have believed it.
"You're not just a genius," Zephyr said at last, bitter amusement in his tone.
"You're an anomaly."
"A monster that's never existed before in history."
After a long silence, he gave a self-mocking laugh.
"There's… nothing left I can teach you."
"Rokushiki? You've already mastered it."
"Haki? You just finished both types in under an hour."
"What else is there?"
Even Conqueror's Haki—
Zephyr himself couldn't use it.
And Kai's Conqueror's Haki…
Was already approaching Sengoku's level.
For the first time in his life—
Zephyr felt genuinely powerless as a teacher.
"Thank you for today, Zephyr-sensei," Kai said seriously.
"If not for your guidance, it would've taken me longer to refine Haki."
Zephyr shook his head.
"No."
"This isn't my achievement."
"With your talent, anyone could have taught you."
"That's the truly terrifying part."
After a pause—
He let out a long breath.
"For the time being, just continue training on your own."
"I… need to go report some things."
Kai nodded.
"Understood."
Zephyr turned around.
This time, he didn't just walk—he almost ran.
Watching his back grow smaller in the distance, Kai rubbed his chin thoughtfully.
Then—
He went straight back into training.
This time, fully focused on sharpening both Observation and Armament at once.
He opened his senses.
Observation Haki spread out around him.
At the same time, both arms darkened, wrapped in pitch-black Armament.
Power surged.
Every punch carried mind-numbing weight.
Every casual strike now held terrifying destructive power.
At this stage—
Kai no longer feared Logia users.
In fact…
He was starting to look forward to fighting Smoker again.
"Next time…"
"I won't need seastone."
Right on cue—
A familiar system prompt echoed in his mind:
[Training Result: Observation Haki Proficiency +0.01, Armament Haki Proficiency +0.02]
[100x Training Amplification Applied]
[Host gains: Observation Haki Proficiency +1, Armament Haki Proficiency +2]
Kai's lips curled.
"Good."
"Progress is still climbing fast."
Not far away—
On another part of Marineford…
Zephyr was sprinting toward the Fleet Admiral's office, heart still pounding.
He had to tell them.
Immediately.
That on this sea—
A monster who had mastered dual Haki in a single day…
Had appeared.
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