It's not telepathy. It's basic human brains. Everyone blocks things from their consciousness only keeping the details they deem as important (example you don't notice a pebble on the street when you see a hot girl passing by). Ikki knows this and by moving in a certain way people perceive him as unnecessary info and not dangerous and therefore block him from sight. (At the end of this post is the in verse explanation of trackless step)
He does do that in phantom form. Remember when he fought stella? His blade literally went from her right shoulder to her left waist. A slice in half, no damage dealt, instant incap. He doesn't do that usually cus in tournaments phantom form is not allowed. Otherwise, why would regen cover something when there is no damage dealt? It's just a sword that's going through you, 0 damage (bookmaker style i guess you could say).
That's true i was talking about him disarming ikki, but why would tk work against higher lifting strenght. If your TK can lift 1 ton and i can lift 10 tons, how in hell will you be capable to remove the sword from my hand with TK?
Trackless Step:
"I can tell by looking. It's obvious that her response to her opponent's movements worsened all of a sudden."
"It's just as Stella-chan says. Even though the President is moving normally, it looks as if she can't see it."
Arisuin also felt that there was a problem with Shizuku's movements. And of course, Ikki did too. But Ikki could already see a few more things than the other two.
"…It's exactly like that, probably."
"Eh?"
"Shizuku really can't see her. I've also seen something like this once before."
It was that time before his debut battle, when he met the Yaksha Princess Nene Saikyou at the reception desk.
"That time, Saikyou-sensei got right in front of me in an instant. Even though I didn't let her out of my line of sight for even a moment, she got to my chest before I knew it. Right now, Raikiri is probably using the same body technique, I think."
"Ahaha. As expected of Kuro-bou. You noticed it after all, huh?"
A voice descended from an angle above. Ikki turned his eyes in that direction, where a bewitching petite woman dressed in a kimono and an imposing woman clad in a suit were descending the bowl-shaped stadium's stairway.
"Hey there~. It's been a while ÔÖ¬."
"Saikyou-sensei, and Madam Director. The two of you together, I wonder if something's going on?"
"What, she just called out because she saw you guys, not because there's a reason."
The board chairman, Kurono Shinguuji, answered Arisuin's question. These two only came to see the duel between fellow B-Ranks in an ordinary Selection Battle. They only greeted them because Ikki's group was having an interesting conversation.
"…Hey, Nene-sensei. The thing that Ikki noticed, is what he's saying correct?"
Saikyou-sensei confirmed Stella's question with a nod.
"Yep. That is an ancient Japanese martial arts technique called Trackless Step that merges breath control and footwork. Or something like that―"
"…Eh?"
In an instant. Saikyou who had to be at least five meters away from Stella reappeared very close, and―raised Stella's plump breasts from below while rubbing them.
"Eek!?"
"Oh, this kind of feeling? Well, no milk's coming out. Yet it's super soft~ÔÖ¬"
"Kyaaaaa! Wh-Wh-What are you doing!?"
"I was wondering if rubbing yours would make mine grow."
"If you want to grow then go rub your own!"
"I don't have anything to rub, IDIOT!"
"You're getting angry at the victim!?"
Ignoring the two noisy people, Kurono asked something of Ikki.
"Kurogane. Someone like you has already seen through how Trackless Step works, right?"
To that inquiry, he nodded.
"Somewhat. If you tell me to do the same thing, I could probably do it."
"Hey Ikki, what is this Trackless Step?"
"Let's see, humans are nothing more than animals, and like a machine they can't process all the tiny details that they see and hear, and the brain certainly can't consciously recognize all of those sights and sounds. After all, if they processed and analyzed everything they see and hear, the brain will burn out. Therefore, the human brain will toss low-priority information into the unconscious, and abdicate recognizing them in order to ease the load on itself. This thing called Trackless Step is a martial arts technique that applies peculiar breath control and footwork to slip its user's existence into the opponent's unconsciousness. As a result, even though Shizuku can still see Toudou-san, she has become unable to recognize that fact. Even though the brain and the eye can capture Toudou-san's movements, they can't be processed because the consciousness is classifying them as unnecessary information, to the degree that a life-threatening danger can approach to little more than a blink away.
"Spot on. You understood it well."
Kurono praised him as if in admiration, because there were no faults in Ikki's answer that divulged the mysterious mechanism that was assaulting Shizuku.
Right. There was only unconsciousness within.
The opponent was making everything about herself imperceptible by shifting her breath and body a half-step, and by sliding into that interval, she had dodged the awareness locking onto her. That was the mechanism behind the old-style footwork Trackless Step.
