As Ken hit his grandpa with the blunt side of the Stormbreaker he could see that the hand of Grandpa had turned black. The hit of the hammer wasn't able to go forward no matter how much strength Ken gave.

"Damn! The lightning did nothing. Even his clothes are fine."

"What a fine grandson. It seems you have hidden quite a lot. Tell me what kind of fruit you ate?" Garp asked.

"Do I look like someone who is from the Grand Line that shouts out their own Devil fruit from the start itself?" Ken took a few steps back as he combined both Mjolnir and Stormbreaker to send a lightning attack to Garp.

Luffy on the other side was having fun beating down the marines. After the first marine went down, the others took Luffy seriously as they took out their weapons to take down Luffy, but he was too fast. Luffy was only using his stick, his taijutsu and didn't even bother to use his rubber fruit against these people.

Using the rubber fruit would be an overkill!!

After the huge lightning attack, there was dust and wind around Garp. Ken knew that this lightning would do nothing and he was ready to make his next move. Luffy was almost done with his fights and had knocked down a handful of marines. These marines too were in a semi-vacation mode as Garp himself just came for a vacation and these guys too didn't come with all their equipment.

After being hit by the lightning, Garp emerged out of nowhere near Ken who was waiting for reaction. Garp had appeared at the blindside of Ken so he wasn't able to see Garp who had used his hand to land a punch at Ken.

But the premeditated punch didn't land on Ken as he dodged and took a leap backwards. It was Garp's turn to be surprised. Garp had used one of the six styles of Marines. The shave. It was like teleportation. And Garp was pretty sure that he was fast enough. But he still missed. After a moment of surprise, there was again a smile on his face.

"Hahahaha.. Didn't expect you to learn Haki by yourself. You have surprised me more Ken."

"Who is here to surprise you? Luffy, are you done?" Ken shouted. The answer he got was Luffy appearing near Ken with his body flicker jutsu.

"Ready?" Luffy shouted.

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"Let's go." Ken jumped at Garp as they both now used their respective weapons to hit Garp from both sides. Ken used the frontal assault as he was basically a tank while Luffy being the ninja used the knowledge of the past to hit Garp from the blindside.

And thus the epic battle started of 1v3.

Luffy was trying to attack Garp and even landed a few punches and Enma at the body of Garp while Ken used his Mjolnir and Stormbreaker. Garp seemed like he was having fun. And this irritated Luffy a lot.

Seeing that Garp was entangled a bit with Ken, Luffy did his first ninjutsu in the battle.

"Earth style : Great Mud River."

And this single made the jaws drop of the people who were hiding far away and even Garp too because this single move made the land on which Garp was standing transform into a huge mud river and drowned Garp till his knees. This sudden attack was not what Garp expected. He did feel from his Haki that something unprecedented was going to happen but since he didn't look into the future he couldn't say what it was and his entanglement with the lightning infused attacks of Ken didn't allow him to get a respite.

After the mud river drowned Garp, Luffy didn't stop as he made hand signs and used another jutsu to make sure Garp would fall down on the land and only then Ken could do the trick.

"Earth style : Dragon mud bomb."

This move threw mud bombs at Garp at high speed. The bombs were hitting Garp like small canons and this attack made sure that Garp would fall on the mud river that Luffy had just created. In fact, after doing this Luffy even used Enma to hit Garp at his chest by lengthening the stick.

This was the chance Ken had been waiting for. He took his Mjolnir and went straight to Garp and without giving him time or the space to escape he put the Mjolnir right on his chest. The mud river instantly vanished like it had never appeared before and Garp was lying on the ground with a hammer on top of his chest.

Garp seeing this started laughing. He was really surprised by the move that Luffy did. He had seen many people doing many moves in his life but this was the first time he had seen someone create a mud river out of nothing and even make it vanish. This was a new thing for Garp and that made him excited.

"Not bad kids... Not bad. But this isn't enough. I am proud of how powerful you both have become. Now it's time to come with .... Eh!!" After the initial laughter and happiness Garp's smile slowly vanished away as he realized that he couldn't get up from the ground. No he couldn't even move from the ground.

Ken and Luffy who were standing before Garp smiled as they saw this. This was the trick that Ken had been itching to try from the start itself. He knew that Garp would underestimate him and not use his full Haki. Being the grandpa of these two he would hold himself back and this was the gamble that they both wanted to play.

And it paid off. Ken was able to put the hammer on the chest of Garp and now no matter what, he would never be able to escape this. No matter how powerful a person was! No matter who he was. Only the worthy are able to lift the hammer and Garp was definitely not one of them.

"Grandpa, we are sorry but we will have to do this." Ken said.

"What is this hammer kid, why can't I lift it up?"