Tower x Zushi

When Gon and Killua arrived behind Jett, Jett was still thinking about the whole situation. Seeing as Jett wasn't on his guard Killua understood that the shooter had gotten away, but he still kept his Nen active. Gon was also still on guard, keeping his nen active, while sometimes looking at Jett with a complex expression. Jett wasn't worried about another attack, because he had let his guard down on purpose. To be more precise he had covered his body in a dense aura and used (In) to hide it. 

"I don't sense anyone around that could be targeting us," Killua said. 

"Yes, they didn't leave any trace behind. Their Hatzu was powerful, it got stronger and faster the closer I got," Jett said. Killua and Gon already knew about Hatzu since Jett had been teaching them about Nen for the past week while they traveled. 

"I don't understand why they ran, their Hatzu was strong if they waited for me to come out from my hiding place, a well-aim shot could have killed me, or maybe it was just a test. But that's just my speculation," Jett continued explaining.

"Did you piss someone off, to make them target you? Aside from my brother," Killua asked. 

"Ha-ha, well I also thought about him, but he would come and kill me himself. I do have something in mind, but I would have to wait to investigate." Jett said turning around to look at Gon and Killua. When Gon saw Jett looking at him he wanted to turn his head away, but the angry look in Jett's eyes stopped him from looking away. 

"(sigh) Gon, they only attacked me this time, and I was verily able to survive this time. You on the other hand. If the next shot had been aimed at you, you would have been killed. I know you were worried about me at that moment, but how would you be able to help me if you died? You didn't activate your Nen after my warning," Jett said. 

"I'm sorry Jett," Gon said simply. 

"I know how you are Gon, so it seems I'm going to have to beat that kind of reflex into your body. I need it too, reaction speed to unexpected attacks. Killua you could use it too," Jett said looking at Killua. 

"What? I reacted in time, I don't need that kind of training," Killua said. 

"You do your reaction time is fast, but you're too overconfident," Jett said, Killua said nothing. 

"I have a plan to train our reflexes to sudden attacks. Each of us will attack the other at a random time, we will block the attack with Nen or dodge. Our reflexes and Nen control will become stronger too," Jett said with an evil smile. 

On the way back to the battle tower, both Gon and Killua were on guard flinching at Jett's every movement. It didn't even register in their mind to them to attack him, all three of them were supposed to be attacking each other. Jett was going to attack them, but what fun would it be if he did it right after they talked about it? Their walk back to the battle tower was fun, to say the least; well for Jett. 

After their registration, they had their first fights. They were easy since most of the people were regular humans. All three of them were already Nen users so their strength was even higher. Killua had suggested for Gon to only push his opponents away, but Jett made sure for him to knock out his opponents. Then again after his fight, Jett realized that people on the lower floors were not going to give them any fighting experience. 

As they left for the 50th floor they also encountered another boy that looked about their age. As they waited for the elevator to come and the boy was about to speak to them, Jett decided to attack Gon and Killua. With a rapid movement, Jett punches them both sending them to the floor. 

"What the hell," Killua. 

"Jett, what are you doing?" Gon. 

"What? Don't you remember what I said before, is not my fault that you guys forgot, but this kind of training is going to be fun," Just as soon as Jett said that Gon and Killua attacked him. Of course, Jett was ready to dodge all the attacks. The boy on the side was just looking at them with a shocked face. The three of them stopped after a few minutes of playing around, the boy on the side took that chance to introduce himself.

"I am Zuzhi," Zushi said. 

"Jett," 

"Gon," 

"Killua," 

"You guys are incredible you're able to move so fast, what school did you guys train under," The boy named Zushi said. 

"We didn't train under any school," Gon said. 

"What?! To be able to reach such a level without being guided? That's a real shock for me," Zushi said. 

"Zushi, That's good," a man's voice came from the side, making all four of them turn. 

A man in glasses and black hair was walking up to them, he was unkempt, or at least half of his hair was. His hair was half combed, along with his shirt which was only half tucked in. As a small habit that he developed while searching for other Nen user Jett use (Gyo) on the man. On the corner of his eye, he also saw Zushi, who had the same aura as a Nen user. 

"They are both Nen users," Jett whispered making sure both Gon and Killua heard him. While not all Nen users are bad you can never be too sure, since hiding your aura is a must for all Nen users. After hearing Jett's words Gond and Killua covered themselves in a small aura. They had been attacked a few hours ago so they were instantly on alert, especially Gon who didn't want Jett to be mad at him again.

This was something Jett had been training God on, of course, Killua being next to them also heard them. Jett didn't mind if he copied anything they did, these techniques were for training their Nen, and it wouldn't affect Killua's abilities when he developed his own Hatzu. The premise of the technique was that they wouldn't have to activate their Nen from scratch, with the Nen already being on their body they could easily gather it in any part of their body to defend against the first attack. 

"Ha-ha no need to put your guard up, I don't mean any harm, My name is Wing and I am Zushi master..." Before he could finish he saw Jett attack Gon and Killua again by punching them in the stomach, this time he had used Nen to attack. 

"Ha-ha-hah, you guys need to be more aware and not focus too much on only one thing," Jett said. Jett had felt that Killua had reacted to his attack, so he had moved a little faster to attack him. 

"Damn you," Killua said. Again they started attacking Jett, he had attacked them as soon as they thought he would not attack them again because he had attacked not too long ago. Jett was only smiling while they attacked him not caring about the people around. 

They all went together to the 50th floor and waited for the match, not soon after they entered Killua and Zushi were picked to fight against each other. Killua being Killua didn't take Zushi seriously even after finding out that Zushi was a Nen user. 

If this had been the original story, this moment would be the part where both Killua and Gon found out about Nen. This time it was different, Killua already knew Nen, so his fight with Zushi was different. Killua covered his hand with Nen and attacked Zushi, Zushi himself had sensed something and had tried to block with his own Nen but was knocked out. After all three of them went up to the 150th floor without stopping, the people were still too weak for them to have any trouble advancing. 

Their advancement did not stop until they went to the 200th floor. Killua had stopped advancing the tower before he got to the 200th floor, he didn't know what was on the 200th floor. As they were walking to the registration desk, Jett sensed a dense killing intent. He didn't bother saying anything and simply covered himself in his aura and didn't stop walking. Killua and Gon at his side did the same, they already knew that in front of them was a Nen user. 

Halfway down the corridor, someone stepped out, and in front of them stood none other than the person Gon was searching for, Hisoka. Jett was still worried about Hisoka not because of their Nen quality or Nen control, but because of experience, but that was going to end in these six months before the auction in York Shin. Jett did stop to look at Hisoka today it wasn't him who would be facing him. 

Hisoka standing in front of them saw Jett trying to ignore him, with a sadistic smile on his face he tried to reach out to Jett. Jett simply flashed landing on his next foot as if he had simply taken the next step. Jett mastered the flash step, it was flawless, if he tried he could even step in the air, which was the advanced technique of the flash step. Gon on the other hand had stopped in front of Hisoka looking up at him. 

"I didn't expect to see you here. It makes it easier for me," said Gon. 

"He-he-he, You've come quite confident since you acquired Nen. Nen is quite deep. To speak openly as you are now, I don't want to fight you. But come out victorious from only one fight in this group and I'll be your man," Hisoka said walking away. Three people appear after Hisoka is gone. One was in a wheelchair while another's left arm was missing, the last was standing or sitting on a stick while holding a wooden cane. As they were registering the three cripple people come behind them. 

"Problem," Killua said, Jett on the side was silently looking, he then spoke. 

"There are three of you and three of us, how about a fight?" Jett said. 

"Oh, you are sure of yourself," said the man with one arm. 

"Does that matter, Gon, Killua right down a date for tomorrow," Jett just said, writing down a date for a match. 

After getting their rooms, they saw they were already scheduled for a fight. It wasn't a surprise Jett had instigated it after all. The first fight was Gon, then It was Killua and lastly Jett, they didn't know which name belonged to what person so they didn't know who they would be against. Jett was sure of something, they would win, while he could see the other three knew Nen longer than them, he could see they were weaker than Hisoka. Jett could also see that Gon wanted to fight already, so he could fight Hisoka. 

Jett had been training Gon in Nen for only a few weeks but that was enough for him to win the fight. The fight against Hisoka? If it was returning the punch Gon got on the hunter exam, he could do it. Wining was a whole other thing, Hisoka had already demonstrated he was a Nen master, and his control over Nen was stronger than Gon's. Jett was also thinking about how he would do in a fight with Hisoka, if it was just a fight based on the rules of the tower then he would win, but a fight to the death...He still needed experience, and he was planning to get that in these six months.