My Perfect Isekai: Pragmatic Protagonist, Progression Fantasy and Strategy

CHAPTER 71: FIGHTING THE CURRENT AND BODY CALIBRATION

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Morning in the hidden basalt valley arrived without warning, ruthless and silent. Ice-cold, thick fog hovered above the roaring current of the stream, crawling across the damp earth and forcing its way through the gaps of the shelter made of branches and hides. I opened my sapphire eye and immediately felt my body send a powerful, unmistakable feedback signal. Every single welt on my back, every shoulder battered yesterday, and my bruised ribs throbbed with a dull, pulsing pain at the slightest movement. The energy channels in my chest remained silent, blocked by the old man's firm barrier, while the powerful engine of my Vessel idle-cycled, disconnected from my motor pathways.

"Get out here, kid," the old man's rough, terse voice called from outside. "Time doesn't wait."

I stood up, but instead of putting on heavy clothes and my black coat, I stripped off everything, staying only in my underwear. I decided not to make things easy on myself—the harsh, freezing cold and direct contact with nature suited this spartan discipline perfectly. My tall, hard frame, covered in fresh purple bruises, shivered slightly as my bare feet touched the icy, damp ground outside the shelter.

Sensei was already standing on the bank of the stream, holding his light, flexible bamboo staff in his hand. The old man looked as if he needed no sleep at all. His worn gray robes were dry, and his eyes, colored like misty Tiger's Eye, emanated the same unwavering calm and hardness. He glanced at me standing in just my briefs, raised an eyebrow slightly, but refrained from making any comment. Inwardly, he simply reconfirmed what he had known all along—this kid possessed a rare breed of stubborn, predatory madness.

"Get in there," Sensei instructed, pointing the tip of his bamboo staff toward the middle of the roaring, freezing stream.

The current in this spot was exceptionally swift. Water crashed against black basalt boulders, churning up thick, white foam. Right in the center, where the river's rush was strongest, a single smooth, round basalt rock—slippery with silt and moisture and roughly the size of a loaf of bread—protruded from the water.

"You are to stand on that rock. On one leg. And maintain your position," the old man ordered, puffing on his wooden pipe and releasing a plume of gray smoke.

I sized up the distance, the stream, and the slick basalt. Logically, the task seemed simple, almost trivial for someone with my physical strength. Wasting no time on pointless discussion, I stepped barefoot into the freezing current. The rushing water immediately slammed into my bare calves and thighs, the icy cold driving into my skin like thousands of tiny needles. Gritting my teeth, I waded through the water, lifted my right leg, and placed my bare left foot onto the rounded boulder.

Hoping to secure my position, I instinctively tensed the powerful muscles of my thigh and calf, attempting to anchor myself onto the rock through sheer, brute physical force.

That was a mistake.

In a fraction of a second, the roaring current hit my stiff, locked leg like a rigid, unyielding dam. Because my body did not absorb the water's impact, the physical resistance generated a massive force of momentum that simply swept my foot right off the smooth basalt. I lost my footing and, with a loud splash, fell backward straight into the icy, deep pool of the stream.

I surfaced a few seconds later, sputtering loudly and wiping freezing water from my face. Free of heavy garments that could soak up water and drag me down, I moved lightly, but the cold hit my exposed skin with double intensity.

"Wrong," Sensei called out curtly from the bank, without even removing the pipe from his lips. "Too much force, too little brain. You are fighting the river as if you were a tree. And a tree eventually snaps under the weight of the water and floats downstream."

I waded to the shallows, my analytical mind immediately breaking the fall down to its core components. Dismissing emotion, I felt neither frustration nor anger. This was pure physics and fluid mechanics. Muscle tension created a rigid, flat barrier. Having no way to pass through, the water hit with its full mass, overcoming the friction between my slick foot and the wet rock. To stay on that rounded boulder, I had to do something completely contrary to my prior combat instincts.

Instead of tensing my frame and battling the current, I had to become transparent to the water. I had to let its momentum flow around my structure without generating resistance.

"Again," I muttered, returning to the stream.

I clambered back onto the rock, lifted my right leg, and this time attempted to relax my left calf, lowering my center of gravity deep into my hips. For a dozen seconds or so, things went significantly better. The water flowed past my leg while I subtly balanced my frame. However, my brain, conditioned for constant control, subconsciously sent a signal to stiffen my foot when a stronger wave struck my ankle.

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The physical resistance instantly broke the friction.

Before I could correct my posture, a small basalt pebble whistled from the bank, thrown with uncanny precision by the old man. The stone struck my right shoulder directly on the spot I had subconsciously tensed a second earlier. The impact was swift, painful, and knocked me completely off balance once more. I tumbled back into the freezing water with a heavy splash.

"You're locking your hip," the old man commented as I spitted out water. "Your frame remembers fighting through tension. You think striking is only about muscle power. That's why when you feel danger, you freeze up like a dead log. Move."

I stood up, feeling cold water stream down my chest and back. Across my face, inch by inch, that predatory, arrogant smirk began to spread. My sapphire eye glinted with wild, masochistic satisfaction. This freezing stream, the pain from the pebble's impact, and the continuous falls were not punishment or torture. To my focused mind, every blow from the old man and every tumble served as a tangible log of errors.

It was the most precise, uncompromising feedback I could possibly receive. The old man's stone struck precisely where I subconsciously generated unnecessary tension. Pain highlighted my biomechanical errors down to the exact millimeter. I felt an incredible, predatory thrill from this process—it was the engineering calibration of my own physical motor system.

"Got it," I said, my voice devoid of fatigue, containing only sharp, pure enthusiasm.

I returned to the rock. And I fell again.

I stepped onto that basalt boulder time and time again over the following hours. The stream's current was unforgiving, and Sensei remained inhumanly vigilant on the bank. Every time I minimally locked a knee, tensed my shoulders, or shifted weight to my heel, the old man called it out without blinking, either with a strike from his bamboo staff or a well-placed pebble throw. Fresh purple bruises bloomed on my bare skin, while my back and shoulders were striped with red welts that stung beneath the icy water.

Yet I chuckled quietly under my breath, choking on that wild satisfaction. My mind worked at maximum capacity, constructing a internal map of my frame. I logged every unnecessary tension, every faulty support point, and eliminated them one by one. I was learning to trust gravity and physics rather than raw muscle power.

The sun had already begun to dip behind the tall basalt walls of the valley, casting long, dark shadows over the clearing when I stepped onto the rock for the hundredth time that day.

I took a deep, calm breath. I relaxed my shoulders, letting my arms hang completely loose at my sides. I lowered my hips, unlatched my ankle, and allowed my left foot to literally spread across the rounded shape of the basalt, molding itself to every irregularity of the stone.

The water slammed into my calf.

This time, however, it met zero resistance. I did not tense my muscles. Instead, my ankle and hip performed minimal, almost invisible, fluid micro-rotations, absorbing the river's energy and allowing it to flow freely around my leg. The rush of the freezing current no longer yanked at my frame—it became an element of my balance. I stood motionless like a basalt statue in the very midst of the raging element, breathing slowly, my face completely relaxed, my sapphire eye fixed on the horizon.

No stone flew from the bank.

Sensei stood in silence, holding the bamboo lowered along his thigh. He removed the pipe from his mouth and slowly let out a plume of smoke that quickly dispersed over the water. For the first time, a rare, genuine spark of recognition flashed in his deep, Tiger's Eye-colored eyes. The speed with which I calibrated my body, erased hardcoded habits, and adapted to harsh physics without using even a single percent of energy or telekinesis was simply unnatural. This was not mere stubbornness—it was cold, brilliant intellect applied directly to body mechanics.

"That's enough for today. Get out," the old man uttered curtly, turning toward the fire pit.

I slowly stepped off the rock, feeling my muscles tremble with exhaustion and my bare skin sting from the cold and impacts. When I reached the bank, I was shivering violently, and my Vessel throbbed with purple marks, but that same predatory satisfaction burned bright in my eye.

That evening, we both sat by the crackling fire. Red flames licked the basalt stones, warming my chilled body as I finally put on my dry clothes and warm leather coat. The scent of burning wood mingled with the aromatic smoke from the old man's pipe. I slowly sipped clean, boiled water from a simple clay cup, listening to the loud roar of the stream that had so ruthlessly battered me just hours earlier.

"What you felt today is the foundation of the Sapphire Flow Style," Sensei remarked, gazing into the fire that illuminated his scar-covered face. "Most fools believe combat is a matter of who hits harder and who has tougher skin. True craft lies in the elimination of friction. Your body must become like that stone and that water simultaneously. You are to absorb the enemy's force, allow it to flow through your structure without offering resistance, and then redirect it and return it with doubled power. If you are rigid, you will be broken. If you are fluid, nothing can touch you."

I listened to him with complete focus, my mind instantly translating his words into logical blueprints. Inwardly, I agreed. The old man's theory was brilliant in its simplicity. Previously, possessing vast energy channels and telekinesis, I had hurled myself at enemies like a battering ram, relying on brute momentum. Now I understood how wasteful that had been.

My analytical mind was already designing the future application of this theory. If I learned to move with such fluidity without magic, what would happen when my energy channels were finally unblocked? When I layered the engineering of my channels and sapphire plasma onto this frictionless, perfect biomechanics?

I smiled quietly, and in my sapphire eye, reflecting the red flames of the campfire, ignited that same predatory, destructive fire that a year from now would shake all of Crossgard.

"Tomorrow," Sensei muttered, closing his eyes and leaning his head against the shelter wall. "You will stand on that rock with your eyes closed. And I won't be throwing pebbles—I'll be striking you with the bamboo at full speed. Go to sleep, kid. Tomorrow your list of errors will be much longer."

I lay down on the hard ground inside the shelter, placing my leather coat under my head. Listening to the rush of the stream and the crackle of the dying fire, I felt my entire frame throb with sharp, clean pain. I fell asleep with a deep, predatory sense of satisfaction. The harsh training had officially begun, and I had no intention of resting until I forged myself into a monster.

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