-----
After fighting Mirai, Louis continued swinging his blade. Sweat poured from his body as he released a potent aura of sword energy.
Each swing synchronized with his energy flow and breathing, yet it placed tremendous strain on his frame.
Every time he executed that motion, he had to rest for a full minute, otherwise his body could not contain the accumulated power.
Thus.
Every minute, Louis swung his blade.
But sometimes his concentration broke and...
"Ugh?!"
His entire body twisted in agony. He vomited blood and collapsed.
The next day, Louis would awaken in his bedroom, click his tongue in frustration, and immediately leap from the bed to rush toward the training ground.
He ate nothing. He did nothing else except grip his sword and swing.
"Master Louis! I had to heal you yesterday because you overexerted yourself! You collapsed! W-What are you doing?!"
"I am learning Sword Breathing."
"What?! That's an extreme form of Sword Cultivation. You're not ready—"
