30. The same old trick
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."Thê source of this content n/o/v/(el)bi((n))
"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.
"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?"