Tsuchi knocks out Touma

Tsuchimikado said, extremely lightly, “Ten seconds. If you can withstand it for that long,
I’ll give you a compliment.”
A slam rang out from Tsuchimikado’s fierce footstep.
Tsuchimikado closed the three meters in the blink of an eye. Those footfalls, however,
were not the sound of him stepping on the floor.
His feet.
It was a grand, slamming noise of him breaking the rules and stomping on Kamijou’s big
toe.
“Gah...ah!?”
The intense pain felt like a nail had been hammered into him, and he tried to retreat,
but his feet were tied. His body jerked to a halt, and Kamijou instinctively cast his gaze
down upon his feet.
That, however, was a fatal mistake.
His downward gaze having created a blind spot in his view, Tsuchimikado brought down
a head-butt from above. His hard forehead rocked the crown of Kamijou’s defenseless
skull.
The impact caused Kamijou’s legs to give out. The shock was like a concrete block or
glass ashtray had been brought down onto his head at full force.
However, Tsuchimikado didn’t stop.
His right hand finally moved. His fist swung wide out to the side, looking like it was
trying to aim for the side of Kamijou’s head. In boxing terms, it would be a hook. It was
a one-hit, one-kill pugilist skill targeting his temples, with a curving path parallel to the
ground.
With his foot pinned down, he couldn’t back away. His hazy awareness wasn’t able to
ascertain the attack or consider avoiding it. Kamijou instantly brought up his own hand
to protect his temples—
—And the fist caught the air.
(...?)
The pause didn’t even last a second, but Kamijou was puzzled. They were at such close
range their noses could touch—there was no way his fist could miss. Then why had he
made it miss?
Yes—he didn’t miss, he made it miss?
The answer came to him not a second later. Tsuchimikado’s fist, having passed by his
temple, went around and was going straight for the back of his head. As if wrapping his
hand around his neck to hug him.
The back of his head.
The vital spot judged by even karate and boxing to be against the rules, since it had a
chance of leaving lasting aftereffects.
A huge impact rang out.
“Gah—ba...ah!?”
The strength in Kamijou’s body all flew out of him at once from that one hit. His body
sank straight down. Tsuchimikado’s next blow passed overhead the fallen Kamijou, by
coincidence or otherwise.
However, Kamijou couldn’t turn that into a chance to attack.
Because of the so extremely savage, rule-breaking blow, he fell to the floor, unable even
to pick himself back up. His two arms trembled irregularly. His sense of balance was
shot, and he didn’t even know which direction he would stand up in. The strength left
his gut, and the contents of his stomach nearly came back up.
If Aureolus’s and Accelerator’s attacks had them punching him uniformly with a giant
metal plate over his whole body, then Tsuchimikado’s one strike was like he had
rammed an iron nail straight into a weak spot inevitably created in a person’s skeleton.
Forward, backward, left, right, up, down, far, near. Tsuchimikado certainly should have
been standing in front of him, but Kamijou was under such an illusion that he was being
punched by a whole bunch of people all at once.
“So you can’t even last three seconds,” said Tsuchimikado playfully, as if looking down
his nose at Kamijou.

- Toaru Majutsu no Index Volume 4, Chapter 4