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With a solid foundation, Leon, in cooperation with Sky Blade, continued to monitor and guide the group throughout the training process. Their learning speed was astonishing.
Soon, it wasn't unusual to see Natasha using Moon step to fly around the beach, her slender legs kicking in mid-air. As she moved, a long blue energy slash would descend from the sky, carving a trench hundreds of meters long in the calm sea.
Meanwhile, Sergei and the others seemed to appear and disappear in rapid succession, their movements creating afterimages. To an outsider, it would have looked like ghostly figures darting around in broad daylight.
A month passed since this intense training began. During this time, everyone had reached a high level of mastery over the Six Techniques, and they had also become proficient in the Life Return technique.
Now, it was time for the second stage of their training—one that Leon would personally oversee.
"Flying slashes."
On the familiar beach, Leon stood in front of the group, speaking confidently like a seasoned swordsman. "Your strength is impressive, but you're missing a long-range attack unless you can cultivate Armament Haki to a high level."
"Until then, flying slashes can fill that gap."
He gestured to the group. "Watch closely!"
Holding an exquisite, luxurious cross sword in his right hand, Leon turned towards the sea. As he raised the sword high, a terrifying, sharp aura radiated from him, distorting the air around him. The intensity of his presence caused Sergei and the others to instinctively step back.
In the next moment, Leon's gaze sharpened like a blade. With one powerful motion, he swung the cross sword towards the sea.
Boom!
Before Sergei and the others could comprehend what had happened, a massive golden slash, hundreds of meters wide, was unleashed. The devastating force cut through the sea, splitting it in two for as far as the eye could see. The sea bed was visible in the gap, along with some unfortunate sea creatures that had been severed by the slash.
For a moment, the sea stood divided. Then, with a loud rush of water, the ocean began to fill the void, and soon, it returned to its natural state.
"Whaaat…" Sergei and the others murmured in awe, utterly dumbfounded by the sheer power they had just witnessed.
Pietro was so shocked that he nearly blurted out a curse, but before he could finish, Wanda and Natasha shot him a glare, causing him to swallow the last word. However, that didn't stop everyone's eyes from lighting up with excitement and awe.
It was unbelievably cool—and terrifyingly strong at the same time.
Even from such a long distance, without being directly in the slash's path, everyone felt a chill. The mere thought of that sharp, devastating attack was enough to make them imagine anything in its way being sliced cleanly in half.
This was the flying slash from One Piece.
However, the version deduced by Sky Blade's calculations was different. In One Piece, the ability to cut iron comes from feeling the breath of an object. But with Sky Blade, they could bypass this process entirely, using the most scientific and powerful methods to achieve the same effect.
The principle involved drawing an arc-shaped vacuum wave in the air with the blade, which was then pushed forward by atmospheric pressure. This technique had strict requirements on the sword's hardness, the proper force exertion, and the precision of wrist movement. Additionally, the flying slash's power could be further amplified by wrapping the weapon in Armament Haki.
Sky Blade, with its immense computing power, made it all seem effortless.
In fact, the technique for generating the required force was similar to the Tempest Kick, but applied to the hands and the sword. With enough skill, even a finger, chopstick, or wooden stick could be used to perform a flying slash.
The sheer coolness and power of this technique left everyone eager to master it.
Before long, they were all fully absorbed in learning how to execute the flying slash.
Meanwhile, Tony Stark, stepping away from his lab for a rare break, was about to meet a guest.
At Stark Industries, Tony sat in his office, casually dressed in a short-sleeved shirt. After shaking hands with the woman who had just entered, he gestured for her to take a seat.
The woman, showing no hesitation, sat down in the chair opposite Tony's desk.
Tony's first impression was that she seemed strangely familiar. Then, it hit him—wasn't she the pilot who had taken Natasha away before? He mused inwardly, Could it be that every woman in that organization is this stunning?
Maybe I should join, he thought jokingly, though he quickly dismissed the idea. He didn't dare say it aloud, mainly because he feared he might get beaten—who knew if this woman's combat skills were as terrifying as Natasha's?
"So, Natasha sent you to pick up the Arc Reactor, huh? How should I address you?" Tony asked, trying to sound casual.
"You can call me Yelena," she replied coolly. It was, of course, Yelena.
Her attitude was professional and business-like. She showed no signs of being impressed by Tony's billionaire status, which didn't surprise him. He simply nodded, gesturing towards the documents he had laid out on the table.
"The two Arc Reactor cores and parts are already loaded on the truck. They're in Warehouse No. 1 of Stark Industries. You can take them whenever you're ready," Tony explained. "There's also an installation flowchart to guide you through the assembly."
Yelena's expression didn't change, and she nodded curtly, clearly treating this as a straightforward transaction.
"Thank you, then goodbye." Yelena said, picked up the document, and was about to stand up and leave.
But Tony stood up and stopped her. "Hey, Ms. Yelena, that's not what our deal said at the beginning."
"What are you trying to say?" Yelena asked coldly, turning to face him.
"I thought we were supposed to be friends, right? But as a friend, Natasha hasn't shown up even once this whole month." Tony shrugged, expressing his confusion. "I mean, what's going on here? Am I just being left hanging?"
Their agreement was clear: within three months, Natasha had promised he wouldn't be targeted by any extraordinary threats. But no one had shown up. How could they protect him if they weren't around? Or were they just that good at staying hidden?
"She doesn't need to show up," Yelena replied coldly. "The deal is still in place. We can guarantee that no idiot will bother you for the next two months."
"How's that supposed to work?"
"If you have the right connections and ask around, you'll understand exactly what that means," Yelena said. Without waiting for a reply, she turned and walked out.