Kaido didn't use any other techniques, sticking with " Thunder Bagua," but with increased power.
He now considers Luffy a worthy adversary capable of challenging him.
Neither of them was very fast, but their movements were full of power, and the aftershocks of each strike shattered the surrounding rocks.
Seeing Luffy's frenzied attack, Zoro and the others, who were recovering their strength, couldn't help but feel anxious. They knew that Luffy couldn't hold on for long in this state.
"BOOM BOOM BOOM BOOM BOOM!!!"
Countless explosions echoed across Onigashima as Kaido and Luffy clashed and separated repeatedly. Each attack was not only a clash of techniques but also a battle of Haki.
Although they weren't fast, their explosive power was extremely strong, even cracking the space around them.
As the battle escalated, the entire Onigashima trembled violently, seemingly on the verge of collapse, with the surrounding seawater surging incessantly.
"Hahaha, that felt great! Straw Hat Kid, give it your all!"
Kaido laughed maniacally, even throwing Hassaikai aside, and chose to clash with Luffy bare-handed.
" Kaido!"
Luffy kept roaring, as if to increase his fighting power, and his two arms turned crimson.
" Gum-Gum Supreme King Kong Gun!"
Suddenly, black and red Inazuma flashed on Luffy's arm, and then he slammed it hard into Kaido's abdomen.
Kaido's fist also struck Luffy, and both of them were sent flying backward.
"Boom!!!"
They crashed into several more boulders before finally stopping.
"Hiss!"
Kaido wiped his mouth and couldn't help but gasp. He hadn't expected that his opponent's fist contained Conqueror's Haki.
Although it wasn't quite at the level of Conqueror's Haki Coating, it still caused him intense pain, and a trace of blood appeared at the corner of his mouth.
Kaido glared fiercely at Luffy, finally provoking his ferocity.
"Roar!"
Kaido roared to the sky, raging like a giant beast, then his entire body swelled up again, transforming into a half-beast state, with a layer of scales appearing on his body.
"Hiss!"
Zoro and the others who were watching the battle gasped, feeling Kaido's aura become even more frenzied.
Luffy's pupils also contracted, but being able to force Kaido transform gave him a glimmer of hope.
" Gum-Gum Elephant Whip!"
Luffy's arm grew enormous again and lashed out at Kaido like a whip.
"Boom!"
With a deafening roar, Kaido, after transforming, was knocked back more than ten meters by the powerful blow, and the ground beneath his feet collapsed.
However, Luffy's eyes were filled with horror, because he felt his arm being grabbed by a powerful hand.
"Come here right now."
Kaido grabbed Luffy's fist and then exerted force, causing Luffy's body to fly involuntarily towards Kaido.
" Gum-Gum Supreme King Kong Gun!"
Suddenly, Luffy's left hand also retracted, attempting to attack using Kaido's power.
However, Kaido's combat experience was far too rich. Seeing Luffy like this, he swung his arm, changing the force that was originally pulling Luffy away, and threw Luffy out.
"Boom!!!"
The immense force Luffy to smash through a nearby rocky hill, and cracks appeared on the ground of Onigashima.
"DuangDuangDuang..."
A cloud of dust passed, followed by a series of bouncy sounds. Blood trickled from the corner of Luffy's mouth, but his fighting spirit remained high, and he continued to bounce on the spot.
"Hmph, what tenacious vitality!"
Kaido hadn't expected his opponent to be able to fight him to this extent. He had knocked the opponent unconscious with a single blow before, so how could the opponent be so resilient now?
Kaido had no idea that Garp had gone to great lengths to train Luffy and the others, nearly killing Luffy countless times.
He came here to challenge himself because he was careless and was caught off guard by his own attack Conqueror's Haki Coating.
However, Luffy in Gear Fourth form has seen a significant increase in both attack and defense, and due to his Devil Fruit ability, he is also very resilient to physical attacks.
As for Luffy, he only had eyes for Kaido, and no matter how much the other party pressured him, his fighting spirit did not waver in the slightest.
" Kaido, I will definitely defeat you!"
" Gum-Gum Black Mamba!"
Luffy launched another attack, his arm like a giant snake, fiercely striking Kaido, but it became unpredictable and could even change direction midway.
"Still flashy and gaudy!"
Despite this, Kaido was noticeably more cautious, his Observation Haki constantly predicting Luffy's attack direction.
Just as he was about to grab Luffy's fist again, he saw the fist suddenly bend and then slam into his chest.
Kaido directly covered his scales with Armament Haki.
"Boom!!!"
Luffy's attack struck Kaido again, sending him staggering back dozens of meters.
However, apart from carving two deep furrows in the ground with his feet, Kaido was not injured at all.
Although Luffy has strong physical resilience, Kaido believes that no one can match him in terms of physique, except for Lin Yuan.
Moreover, Kaido clearly sensed that Luffy's strength had noticeably weakened after such a long battle.
"Haha, kid, you can't keep this up for much longer, can you? Let him guess, can you last an hour? Half an hour?"
Luffy's expression was rather grim. Maintaining Gear Fourth for so long had indeed taken a toll on his stamina, and as Kaido had said, he could only manage for another hour at most.
If the high-intensity fighting continues, they might not even last half an hour.
Meanwhile, Zoro and the others, who had been recovering, noticed Luffy's abnormality. Although he fought fiercely, he was sweating profusely, and steam was appearing on his body.
"I can't watch any longer, I'm going to help Luffy."
A resolute look appeared on Zoro's face, and he quickly charged towards Kaido.
"You all wait here, I'll go help too."
Lawrence spoke to the others and then rushed over quickly, accompanied by Sanji; the two of them could at least unleash some of their power.
As for Molly and her three companions, they didn't go over, since with their strength, they were simply no match for such a battle between powerful individuals.
Kaido and Luffy also saw the three rushing towards them, and Kaido's lips curled into a disdainful smile.
Aside from Zoro, who might pose some threat, he doesn't even consider Lawrence and Sanji a threat. Moreover, after his battle with King, how much fighting power does Zoro still have left?
"Hahaha, good timing! You bunch of little reptiles, I'm going to crush you all!"
" Zoro, Sanji, Lawrence, watch out!"
Luffy seemed to regain some of his senses and quickly shouted, charging towards Kaido.
" Gum-Gum King Kong Gun!"
" Three-Sword Style: Dragon Slayer!"
"Armed - Diable Jambe "
" King Kong Impact!"
At this moment, the Straw Hat Pirates' strongest forces simultaneously chose to attack Kaido.
"Haha, you've come at the right time!"
" Hakai!!!"