Here's the revised text with "Xuan Yan" replaced by "Kai" and grammatical corrections made to fit American English:
Van Oka immediately aimed his gun at Kai, and the others got ready to attack him.
"Tsk hahaha! Who in the world wouldn't be tempted by an ability like the Thunder Fruit!!"
"Well, that's true. To be honest, I was a little embarrassed just now. After all, I have a small face. Now that you're all planning to steal my things, it's reasonable for me to fight back, right?"
"Bang!"
Van Oka took the lead and fired a bullet at Kai.
Kai raised two fingers and clamped the bullet between them.
"What?!"
Blackbeard and the others were surprised that he actually caught the bullet fired by Van Oka with his bare hands.
"Go to hell!"
Bakas lifted a huge stone and threw it toward Kai.
Kai stood there and caught the massive stone with one hand.
"Back to you!"
The huge stone was thrown back by Kai.
Bakas stood there with his arms open to catch the stone. However, when he caught it, he felt the impact.
"I can't catch it!!"
"Whaaaaaaaaaaaah!!"
Bakas screamed and flew backward along with the stone.
Boom, boom, boom!!
Countless buildings were smashed to pieces, and everyone near the dock screamed and ran away.
Bang, bang, bang!!
Van Oka shot at Kai continuously, but Kai moved his body to dodge all the bullets.
Uh-huh!
Kai appeared in front of Van Oka and grabbed his spear.
With a strong tug, the gun fell into Kai's hand. He flicked it, and the butt of the spear hit Van Oka's face.
"Uhhhhhh!!"
Van Oka screamed as his body flew out.
Boom, boom, boom!!
Several more houses were destroyed.
Kai glanced at Du Q, who was immediately startled.
"Fire Style: Great Fireball Technique!"
A massive Great Fireball, about four meters in diameter, erupted from Kai's mouth.
Boom----!!
"Ahhhhhhhhhh!!"
The Great Fireball exploded and engulfed Poison Q.
After the smoke cleared, Du Q and his horse lay motionless on the ground.
"Oka! Bakas!! Poison Q!!"
Blackbeard's expression changed. He did not expect that the powerful crew he had gathered would be defeated by Kai in an instant.
"Hateful!!"
"Dark!!"
Blackbeard unleashed the power of his Dark Fruit, and his body radiated rich black energy.
"Kid, no matter who you are, you're going to regret finding me."
"Dark Acupoint!"
Blackbeard pressed his palms on the ground, and the black energy around him spread quickly, engulfing everything in its path, including Kai.
"Tsk hahahaha!"
"Although I don't know where you're from, if you fall into my secret hole, you're finished!"
"The so-called 'darkness' is 'gravity'! It can attract all power! Even the light of meaning is not immune!"
"It's infinite gravity!!"
"The gravity of darkness will compress objects with infinite force until they are crushed!!"
"You will be crushed to pieces by this gravity!!"
Kai was surrounded by darkness, but he didn't panic at all.
"Buzz————!!"
A huge energy bomb appeared in Kai's hand; it was the Big Ball Rasengan.
Having learned it through Flying Thunder God, there was no way Kai would miss using Rasengan.
Rasengan may seem a bit crude, but this ninjutsu is still very effective, especially since it doesn't require any seals and is incredibly powerful, making it perfect for combat.
Kai threw the Big Ball Rasengan toward Blackbeard.
Blackbeard was startled when he saw the Big Ball Rasengan launched by Kai and immediately raised his palm.
"Dark Water!!"
A black vortex appeared around Blackbeard's palm.
Boom----!!
The Big Ball Rasengan violently impacted the black vortex. When the high-density chakra hit the target, its power was released instantly. Even Blackbeard's Dark Fruit ability couldn't absorb all of it.
"Uhhhhhh!!!"
Blackbeard was overwhelmed by the burst of power, and his body was knocked away.
"It hurts! It hurts so much!!"
Blackbeard writhed in pain, taking a moment to catch his breath.
"What kind of power did you just use? Why doesn't my Dark Water work on you?"
"I'm not a Devil Fruit user, so your fruit powers naturally won't work on me."
Crack! Crack!
Kai's body radiated rich energy, and blue-white arcs wrapped around him.
Boom!!
The ground beneath Kai's feet exploded, and he appeared in front of Blackbeard in an instant.
"So fast!!"
Blackbeard didn't react at all.
Bang!!
Kai punched Blackbeard in the face.
"Uhhhhhh!!"
Blackbeard screamed in pain.
Then Kai grabbed Blackbeard's face and slammed it toward the ground.
Boom----!!
"Whaaaaaaaaaaaaaah!!!"
The ground shook, and a large crater formed.
Kai raised his leg high and stomped on Blackbeard's belly.
Boom----!!
"Uuuuuuuuuuuuuuuuuuuuuuuu!"
The intense pain made Blackbeard's eyes bulge.
Kai quickly condensed a Rasengan in his hand and pressed it against Blackbeard's back, leaving a special mark.
"Whaaaaaaaaaaaah!!"
The double pain made Blackbeard scream.
Kai was about to unleash a few more Tailed Beast Bombs on Blackbeard when Blackbeard suddenly shouted loudly, "I surrender!!!"