“Gaghh?!”
No one grasped what happened.
There was no one there to witness it, and Kamakiri Maniwa, despite being the receiver of the blow, couldn’t grasp what had happened to him.
Next thing he knew – he was sent flying.
Every one of his ten nails had been snapped off.
And each of the broken nails – had turned on him and plunged relentlessly into his abdomen.
Causing him to slam his head into the tall tree behind him – and lose consciousness, never knowing what hit him.
“...Huh?”
Meanwhile – Nanami Yasuri, despite being the one who delivered the blow, had also to catch up with the happening. A bunch of freshly foraged greens in her right hand, she spun around, angled her head quizzically, and regarded the scene with disbelief.
Kamakiri Maniwa, one of the Twelve Bosses of the Maniwa Clan, and Captain of the Bug Unit, a fearsome enough ninja to have earned the nickname “Head Hunter,” had used his ninpo and pounced on her from behind –
For Nanami, however, this disturbance could be handled by mere reflex.

Katanagatari Omnibus 2, Page 35