But then – something he hadn’t thought of happened.
He dodged the slash alright.
When Konayuki swung Soto the Twin, Shichika leapt from its path, with room to spare.
Out of its way, but then –
“…!”
The Twin – came after Shichika.
“Wha… ugh…”
Monstrous strength.
A girl with monstrous strength – Konayuki Itezora.
Having witnessed her casually toss his body on her back, and brandish Soto the Twin in one hand, when he was unable to even lift it up, Shichika thought that he had grasped the scope of Konayuki’s monstrous power – but in truth, his grasp was ever so tenuous.
Thinking she was a kid – he had been careless.
The Twin was heavy, but so is any sword. This heaviness is why the Kyotoryu forsook the sword and began its tradition of the swordless swordsman.
But weight has obvious merits. Weight can be thrown into an attack, and combined with centrifugal force, weight has the power of a wreckiung ball. Shichika need not doubt whether Soto the Twin, the heaviest sword in existence, had weight working in its favor.
Yet.
Konayuki Itezora did not rely on weight or centrifugal force.
She defied the laws of physics, with brute strength.
Relying purely on her monstrous strength, and using it perfectly, to full advantage –
She thought nothing of changing the path of her sword mid-swing.
Thanks to her monstrous strength, the centrifugal force caused by raising the Twin and letting it drop was not even a factor – Konayuki Itezora!
Lo the Itezoras!
Veritable sheaths, of a sheathless sword!

Katanagatari Omnibus 2, Page 246