Which is why Pengin believed that the longer things were drawn out – the greater Hohoh’s chance of being defeated. This went beyond Pengin being innately pessimistic; it was a fundamental truth.
Consider Nanami Yasuri.
The move, if you could even call it that, called Watch and Learn, which was her genius manifest, had something in common with the Life Line – as Hohoh had admitted once himself.
But with a crucial difference.
She needed not kill her adversary or graft on one of their body parts. She simply watched. Watch a move once, and she would learn the ins and outs; watch twice and she would make the move her own. This was what made the Watch and Learn so terrifying – Nanami could come away wielding a move so masterfully that she surpassed the person she had learned it from.
She was a genius.

Katanagatari Omnibus 4, Page 143