Ace put his hand on the hilt of his sword ACE, and infused it with his Armament haki and his Conqueror's haki. He didn't have the luxury of holding back, otherwise he would die.
Monkey D. Garp is one of the strongest marines to ever live. He is one of the few people that was on Roger's and Newgate's level while they were in their primes.
Even now at his old age he is still one of the strongest people alive.
Garp was in the sky and infused his fist with both Armament and Conqueror's Haki, before punching down creating a huge, massive shockwave with such radius that it devastates whatever is in its path.
"Galaxy Impact!"
Ace drew his sword and slashed upwards. Creating a huge arc of haki that tried to cut the galaxy impact that was coming his ways.
The two forces of Conqueror's Hali met and created black lightning that started flashing allover the island, as the island started shaking.
The two ships 300 meter away from the island felt the shaking.
The marines had binoculars and we're watching the island, and so were the Demon Ace Pirates.
The marines saw how Garp suddenly stood up and blasted the Flame Emperor away, towards the center of the island. The punch was so hard it created shockwaves that could be felt from the ships as they started swaying.
Then they saw Garp jump straight up towards the center, and midair he punched down, creating a gigantic bubble of pure shockwave and force that headed straight down towards the Flame Emperor.
The Demon Ace Pirates were completely aghast. This didn't seem like a lovely reunion between a grandfather and grandson.
Luckily, from the center grew a gigantic slashing arc trying to cut the galaxy impact in two. The two forces met and exploded blasting every tree on the island away.
The whole mountain was completely destroyed.
The two forces of Haki also created black lightning that flashed all over the island.
"We need to help him!" Urouge stood up and was ready to fight as well, followed by Cavendish, Yennow and the others.
Law And Jojo stopped them.
"He needs to overcome this if he want to stand at the top of the world. Because.. that's what it looks like there." Jojo said in a serious voice.
This seemed to wake them up from their worry.
They had never met a foe this powerful before, which is why they got so worried.
Their ships were swaying and they could barely stand as the winds were powerful thanks to the following earlier.
At the center of the island, Ace stood up from the ground, cracking his neck.
"Gramps, you're a bit too strong for your age, no?" Ace said as he held his sword.
Ace jumped away as he felt what was about to happen, and in the next second Garp had appeared with a big grin and a slash on his arm, punching the ground where Ace just stood.
Ace put his sword away and punched back.
The two of them started a brawling match as they punched eachother. Each punch created a shockwave..
The Marines and Demon Ace Pirates couldn't see the two, they only heard constant explosions, which came from their punches.
The explosions continued for two hours. Garp stood up from the rift, that Ace had made with his sword.
"Bwahaha not bad... Even your father wasn't as sturdy as you. Your body is almost as strong as Kaidou's!... But you're too inexperienced." Garp said as he was bleeding allover from scratches and cuts.
He even had a black eye, his arms were full of bruises.
Ace nose was bleeding and he had a small cut on his lips. There was also a bruise on his ribs, but it was barely visible. He was barely hurt.
Garp had gotten many clean hits but Ace's stronger physique could handle it.
Overall, Garp looked worse.
"Gramps, isn't this enough?" Ace asked as he didn't want to fight his grandfather anymore.
"You've proven that you can fight them, but I haven't had this much fun in years... BWAHAHA" Garp laughed once again as he launched himself at Ace.
Seing the gigantic smile on his gramps face, Ace couldn't help but to laugh as well.
"WAHAHAHA!" Their explosive punches continued for another hour.
At that point, Garp was panting heavily and Ace was sweaty.
They stood in front of eachother,, the whole island had been destroyed, no green life could be seen and the island was filled craters, rifts and holes.
Garp suddenly stood in a horse stance as his left hand reached his right side, and his right hand reached his left side.
It looked like Garp was about to rip the fabric of space into pieces, almost like he had eaten the quake quake fruit.
"Galaxy split!" He said before he ripped both his hands back their their respective sides, both hands were infused with Conqueror's Haki and armament Haki, which created two forces that were going in two opposit directions and they were on their way towards Ace.
Ace raise this fist and punched down, using the technique he saw his grandfather use a couple of times during this fight.
"GALAXY IMPACT!" He shouted.
As a gigantic force was realised from his punch, creating a gigantic force of shockwaves form his Conqueror's Haki and armament Haki.
Garp's eyes widened in surpised and he hurriedly infused his whole body with armament Haki to protect it.
As Garp's Galaxy Split met Ace's Galaxy Impact, the two techniques clashed and created an unprecedented explosion.
The whole island exploded and the sea water started swallowing the whole island. The black lighting still flashed by creating a heavy atmosphere.
Ace was blasted towards the sea and he couldn't swim up because of the powerful waves that was created because of the shockwaves.
So he held his breath and waited until it calmed down.
After a while when the waves calmed down, he swam up and found that the whole island had disappeared.
"Bwahaha not bad!" Ace heard his grandfather's voice, so he looked back and found the old man a dozen meters from him, swimming.
"Ace, never mind my earlier words, let's meet up often and spar!" Garp laughed out. He had enjoyed the fight a bit too much.
"Old man, if we fight a hundred times, we might sink 200 islands." Ace said, his whole arm was pulsating in pain. He didn't understand how the old man could be so lively after this fight. Old men should be tired!
Suddenly Garp seemed to lose all his energy as he passed out.
Ace saw this and hurriedly swam to his grandfather before he drowned.
Back on the HQ-03 ship, some of the older soldiers looked very pale.
"He's back...." An older soldier whispered in fear. This type of fight, he hadn't seen in in two decades. And Ace reminded him too much of Roger, so for a second he mistook him for the Pirate King.
"Who's back?" A younger soldier asked. He had a nose bleed, the shockwaves had hurt him earlier on.
"Ah, nevermind, go to the nurse and make sure your in good health." The older soldier said as he awoke from his thoughts.
"Yes sir."
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