Sure! Here's the revised text with "Xuan Yan" replaced by "Kai" and grammatical corrections made to fit American English:
Blackbeard was stunned when he heard Kai's words and came to find him. He wasn't famous yet. The only ones who knew him were the Whitebeard Pirates, but he knew everyone in the Whitebeard Pirates. He had never seen a kid like this before.
"Who are you?"
Blackbeard looked at Kai warily. Just by looking into Kai's eyes, he knew that this boy was probably not of an ordinary race.
"My name is Uchiha Kai. Let's find a place to talk."
"Hey! Kid! Do you think you can just walk out of here? If you dare to laugh at me, Uncle Bellamy, you're going to regret it!"
He was Bellamy, a hunting dog with a bounty of 55 million. How could he be intimidated by an unknown kid who appeared out of nowhere?
"Spring Sniper!!"
Bellamy's legs turned into springs, and with a powerful leap, he rushed toward Kai.
Bellamy clenched his fist and aimed it at Kai.
Kai raised a finger and accurately blocked Bellamy's fist with it.
"What?!"
Bellamy was shocked that his opponent could block his attack with just one finger.
Kai's hand shot forward and flicked Bellamy on the forehead.
Whoosh—!
Boom, boom, boom—!
Bellamy flew backward and crashed into rows of houses. When he finally stopped, his eyes rolled back, and he passed out. He lost consciousness the moment he was hit by Kai, so he didn't even have time to scream.
"Whaaaaaaaaaaaah!!"
"I only used one finger..."
"Bellamy... was taken out so easily!"
"Who is this guy?!"
…
The surrounding pirates were terrified, and Luffy and the others looked at Kai in surprise.
It was incredible to knock Bellamy down with just one finger and cause so much destruction.
"So strong!"
Zoro regarded Kai with a serious expression; such strength was extraordinary.
As a swordsman, he had noticed the sword at Kai's waist early on. This guy was definitely a powerful swordsman.
In his heart, he wanted to challenge Kai, but after witnessing that display, he felt overwhelmed. The pressure from Kai's finger was immense, almost like facing Hawkeye, the world's best swordsman.
"No, he's super strong!"
Luffy was also eager to fight Kai, but there seemed to be no reason to engage.
Blackbeard felt a bit wary when he heard that Kai was here to find him, but now that he saw Kai easily defeat Bellamy, he realized this kind of strength was anything but ordinary.
"Let's go find a place to chat."
"Tsk hahaha! Then let's head to my ship and talk."
After Blackbeard finished speaking, he turned and left.
After a while, Kai followed Blackbeard to the vicinity of Blackbeard's pirate ship.
"Hey! Captain! What's going on? Is this our new member? Isn't he a bit too young?" Van Oka, the sniper of the Blackbeard Pirates, was sitting on Blackbeard's ship.
"Cough... cough... Captain... you're back..."
The Poison Q that Kai had met before was also there at that moment.
Blackbeard's ship was made of several large logs and looked very shabby. The future Four Emperors were clearly in the early stages of starting their business, and life was still somewhat tough.
"Tsk hahaha! Don't underestimate him just because he's young. He's very powerful. Uchiha Kai, although I don't know how you know my name, I still want to extend an invitation for you to join us! Let's conquer the world together!!"
"Sorry, I'm not interested in conquering the world."
"Wahahahahaha!! Captain, you were rejected! Hahahahaha!!"
Blackbeard, the burly man, couldn't help but laugh at Kai's refusal.
Blackbeard didn't care. "Tsk hahaha, what do you want from me?"
Kai poured Enel out of the package in his hand.
"Who?!"
Several people looked confused, wondering why this guy had brought someone here.
"I need this guy's Devil Fruit."
The smile on Blackbeard's face faded slightly when he heard this. How did the other party know that he could take someone else's Devil Fruit? But it was pointless to ask.
Blackbeard casually inquired, "What Devil Fruit did this guy eat?"
Kai replied calmly, "Logia Devil Fruit, Thunder Fruit."
"What?!!"
Kai's words were like thunder in everyone's ears.
Then everyone who looked at Enel showed greedy expressions, even Blackbeard.
He was a man who had memorized all the Devil Fruit illustrations.
Logia Devil Fruits were known as the strongest type.
The three Admirals of the Naval Headquarters all possessed Logia Devil Fruits.
The Thunder Fruit was also one of the strongest among Logia, and it could be considered one of the invincible Devil Fruits.
He didn't expect that one day such a powerful Devil Fruit would be delivered to him.
Blackbeard couldn't help but laugh wildly. "Tsk hahahahaha!!"
"I'm so lucky to get Logia's Thunder Fruit!"
"Awesome!! Now my dream of becoming the Pirate King is one step closer!!!"
Kai couldn't help but interrupt Blackbeard's fantasy. "Hey! I didn't say I would give you the Devil Fruit. I asked you to take out his Devil Fruit and give it to me."
Blackbeard looked at Kai with a smile on his face. "Who can prove that this is yours? Now he belongs to me."
Kai curled his lips. "Really, I know you pirates are greedy by nature, but no matter how greedy you are, it depends on who the opponent is. Since I dare to come to you alone, I'm naturally prepared to be attacked."