The agents being stopped by swamp can't move forward. Some of them already trapped and can't move. The ones behind want to move from the sides, but before they can move, they heard a shout, and they stupidly look at the source.
"SHINNEEE (Bakugo-MHA)"-Jon
"Katon: Great Fire Annihilation"-x6
""AARGGHHHH""
The front agents got attacked and get damaged. They tried to run but the fire move very fast so they can't even step back before being engulfed by it, especially the one that being trapped in swamp. The agents at the back is lucky thet they're far and some can run away from the attack range. But Jon's attack defeated majority of them. From about 1400 agents left in battle before, he defeated around 500-600 alone using his fast and wide range attack, it's almost half of them.
No one expect a wide range attack to be used, as a lot of them used closed range weapon at the front line and only some use long ranged at the back. Even some ranger fight close to the front so the damage caused by Jon's wide range attack is devastating as no one from the agents here have devil fruit power that can cover a wide range attack. But if Jon already mastered this jutsu, he can defeat them at once without clones.
Jon knew that he killed lots of people with this attack. He felt bad but he held it for now and calm himself. He already prepared to kill if necessery as he is a pirate, and this is war. When he fight Jackie he doesn't kill him directly, he make him fall from cliff, heck he doesn't even know if he die or not as he didn't check it. He didn't saw him dead so he didn't feel this bad. But now he saw the body burned and he smell the burnt skin. It's really unbearable, but he held his urge to vomit and go back. This is also why he tell Vivi to go back to castle, because he know if his attack succed it would be a gore scene.
The army soldiers and enemy agents have a wide eye seeing this result, they have horrors in their eyes. Even tough the agents knew that this is because they're not prepared for such wide range attack, but the power of that attack is also high. With a dry air and strong wind, the fire became stronger. The army felt fear but they're also relief he is on their side, their morale rise up now. On the other hand, the agents felt fear and want to run, but then they saw Jon panting hard in his place. They know he can't use that again, so they get ready again.
The jutsus take most of his chakra and now his chakra reserve are very low. Now he can only use taijutsu, but at least he reduce the enemies a lot. The army leaders also see this chance so the ordered the army to attack. Jon can stay back but he want to fight even with taijutsu only. He start attacking the agents, but they fight back stronger than before.
He used his taijutsu to the fullest, maximizing his sharingan. He deflect an attack, punching, kicking, he take a sword lay down on the ground, he use it to slash enemies, clashing with their weapon, he even throw it and take another weapon. He attack left and right, he got injured but it's not grave. When he remembered Zoro's feat of defeating hundreds agents in close combat uninjured, alone, make him realised he's still not on par with him at close combat.
~Meanwhile with the other crew~
~Zoro~
Zoro fight with Mr.1, but he can't land an attack at all. Mr.1 have eaten a devil fruit that make his body become sharp blades everywhere he want. The blades are as hard as steel, and Zoro can't cut steel yet. He got a lot of injury but he held his ground. They fight back and forth and Zoro can only defend as his attack didn't have any effect.
"You can't cut a steel, even tough you can cut stone, their hardness is far apart. Except you can cut a steel, you will lose to me. Give up!"-Mr.1
"Never, i will never give up, and i will definitely cut your blades."-Zoro
They clashed again and again, but Zoro can't injure his opponent at all. On the other hand his injury become worse and finally Mr.1 use his strongest move to blast Zoro. Zoro got down and he can't stand anymore. He can only lean back to a stone pillar behind him while breathing heavily, his injury is grave. Mr.1 decide to finished it by cutting the pillar and make it fall on Zoro. Mr.1 walk away but suddenly he turn back. He's surprised seeing Zoro stand again, and he can avoid the falling gravel and stone. Then Zoro take one of his sword and sheathed it. He got into stance, and Mr.1 did the same.
"Itoryu iai: Shishi Sonson"-Zoro
"Atomic Spurt"-Mr.1
They moved forward and clashed their technique. Zoro sheathed his sword again after taking it out really fast. Just when it clicked, Mr.1 suddenly fall with a big slash wound from Zoro's sword.
Zoro vs Mr.1: Zoro's win
~Nami~
Nami facing Mr.1 partner, Ms. Doublefinger. Her power make her can change her body into spikes. Nami used her best tactic, hit & run. She's got to fight her because Zoro left her to fight Mr.1, luckily she have a new staff weapon that Usopp made. Nami's staff is made from 3 short stick that has different functions. Jon can't understand how Usopp made it but the staff can generate heat, cold, and electricity. It even have some party trick like sprinkling water.
Nami can use it to manipulate weather in small area around her, so it' name is Clima Tact. She's not as strong as her enemy, but she can use tricks to defend herself. She can make a projection of herself, like a clone or better called fatamorgana effect using heat to create illusion. She can also make a small cyclone and other weather trick. But she's still can't injure her enemy.
Nami use a lot of trick but her opponent still on the winning side. She can even make a dopping for herself and make her stronger temporarily. Nami then use water sprinkler to rise the humidity, then make lots of heat energy bubble, then some cold too to make cloud. She's getting attacked but keep doing what she planned. Sometime later, she finally finished her preparation and a cloud was made on top of them. Then she swing her staff downward to her enemy and thunder struck her.
She got electrocuted but she's still hold herself to stand. Then the enemy run toward Nami to stab her. Nami stop her with her foot, injuring it, then she do her move but two bird toy with wire come out from 2 staff holes. It make her despaired but it actually bind the enemy and start to spin faster and finally it shot her. The enemy spin and fly through a building, knock out.
Nami vs Ms. Doublefinger: Nami's win
~Sanji~
Sanji fight with Mr.2, they're equal at their power. But Mr.2 have a trick, he used his copy ability to transform into Strawhats but Sanji still hit him, until he transform to Nami. Sanji keep getting hit because he's distracted by 'Nami'. But eventually he found the weakness. Mr.2 need to transform back to his real body because he can't use his Ballet Kenpo with other's body. So Sanji use this weakness to finally win.
Sanji vs Mr.2: Sanji win
~Usopp & Chopper~
Usopp & Chopper fight with Mr.4 with his gun that eat dog devil fruit, Lasoo, and Ms. Merry Christmas. Ms. MC (Merry Christmas) make holes with his power, Mr.4 use it to hide and appear here & there, Lasoo actually shooting balls with it's sneeze that later being hit by Mr.4 with his metal bat, and it can explode. Usopp & Chopper are at disadvantage and on the losing end. Then Chopper use his brain point and catch Lasoo then spread sand on it's nose to make it sneze. Chopper face Lasoo's sneeze to the hole and make a big explosion. The enemies in underground got blasted but they're still standing.
Then Ms. MC hold Usopp legs and bring him toward Mr. 4, he got hit and gravely injured but he stand again. The enemy do the previous move again but Usopp shoot a smoke bullet and jump leaving his shoes. Chopper turn to Horn Point and lift Ms. MC from the ground. Mr. 4 didn't know it's her because of the smoke and hit her, knocking her. Usopp then shoot a hammer and knocking Mr.4 and Lasoo near Ms. MC, then Lasoo sneeze a ball between them and explode, securing Usopp & Chopper's win.
Usopp & Chopper vs Mr.4, Lasoo, & Ms. MC: Usopp & Chopper's win
~Back with Jon~
Jon fight the enemy agents with his all, he start to got less hits even tough his stamina is being drained fast. His move became more efficient, his sharingan help him avoid, deflect, and parry attacks, he used every wepon lay there to make it easier, he even used guns. He use it at such a close range, so he will not missed, and he have sharingan. The more he fight, the more he's getting excited.
"KAKATTE KOI!! (Bring it on)"-Jon
Jon keep rushing and fight the enemies. He got hit sometimes, but he hit more. He throw kunai with paper bomb if there's a group of enemy. He still use his hollow mask, so his red eyes look more frightening. The enemy that face him become scared seeing those eyes. Just when he fight left and right, suddenly he got a memory transferred from the clone that go with Vivi. Crocodile has appeared on the castle, it surprised him. Jon got distracted and got a kick on his guts, but he just run back to castle, saving Vivi is more important.
'Didn't he fight with Luffy, what happened? I hope nothing bad is happening, i must go to the castle now.'-Jon
Jon run to the castle, when the clone dipelled he got some of his chakra back too. So he can run rather fast now and he got to the castle in 5 minutes. He heard a commotion from the castle top deck and he climb the wall to go there. When he arrived, he saw King Cobra and Vivi being tied on the pillar behind. He saw a woman that match the crew description of their story on Whiskey Peak and information he got from Rainbase, Ms. All Sunday, also known as Devil Child, Nico Robin. Then he saw it, a tall man with scar across his face, wearing a green furred cloak, Mr.0 or better known as Crocodile.
Jon doesn't think much and just attack Crocodile. He throw a kunai at him but the kunai just pass through his body, the part where the kunai stab turn to sand and revert back to normal. Jon didn't surprised seeing this, because he knew from the rebels that Crocodile have a logia sand devil fruit. He used it often when he play hero so it's not that hard to know about it. He just want to distract the Croc and flickered to Vivi's side.
"You're okay Vivi?"-Jon
"Jon, be careful, he is a logia."-Vivi
"I know. Oi Croc, where is Luffy?"
"Oh, you're the guy that pop out earlier."-Croc
"That's a clone, don't worry, i'm okay. Now, where's Luffy?"-Jon
"Huh? Like i care if you're okay. Haa, you guys and your captain are the same. Meddling in people business."-Croc
"DAMN YOU, I ASK WHERE'S LUFFY."-Jon
Jon had a tick mark and attack Crocodile by punching him. But his attack pass through him again. He's frustated, then something click in his mind, it can be a solution for this situation.