skill to blind a guy, takes a heavy hit to the face

This boy had faced the esper power of Academy City’s #1 and the ultimate magic of a true
Magic God, but what he feared most was the ordinary martial arts that anyone could
learn.
“Oh.”
But there was no turning back now.
Neoka Norito intended to win this even it meant throwing out his pride. He was
challenging the boy using his rescue squad body, not his power as a magician or a member
of the board of directors.
Kamijou Touma had pushed him to this point.
This was the Neoka Norito he had most wanted to see.
So how could he turn away now?
How could he patiently keep his distance and face the man the smart way!?
“Ohhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh
hhhhhhhhhhhhhhhhhhhhhhhhhhhhh!!!!!!”
He roared and stepped forward.
Two full-power fists crossed in the air.
A dull sound followed.
Kamijou Touma definitely heard it ringing in his skull rather than his ears.
In a pure competition of arm strength, he was no match for the man.
Neoka’s fist had slammed into his cheek, but Kamijou’s fist felt nothing. It had wandered
right past this powerful foe’s face.
He had failed to land the cross counter.
However.
“Did you think…”
Kamijou Touma’s brain was rattled, but he could still move his fist.
So he spoke.
“That was just a punch?”
“!?”
His knees were already shaking and he did not have enough strength left for a fierce rush
of attacks.
So he simply opened his clenched fist.
180
Specifically, he revealed what was hidden in that palm right next to the man’s face. It was
his own blood. He flicked his fingers to launch the drops of blood soaking so much of his
body.
But.
Even that could be used to blind an enemy if used well.
“Sorry about the cheap move.”
“Tch!!”
The man used his fingers to wipe the blood from his eyes and shook his head, but an
opening was an opening.
Blood would coagulate, especially when exposed to oxygen or other living things.
“From the moment I heard you were in a rescue squad, I knew I couldn’t win if it came to
a fistfight. So I had to think up some way of winning even if it was dirty and underhanded.
Just like you did!!”

- Genesis Testament Volume 1 Chapter 4 Part 4