Fighting is what I know and what I'm good at. I was made to destroy. Tear things down without thinking - they perfected it with me. [Then they could harvest her blood into crystalized Mania and spread it like a creeping fire to hungry gang members and desperate men. Despite what she'll tell Shoko at another time about wondering if she can be useful in other ways, it's difficult for Ninety-Nine to see herself in any other way.]

When it comes to it, I'm also good at hunting things down. The smell of your blood, the sound of your footsteps... I could track you even if you got far away from the group.

[That might also explain why she's having an easier time than some of them navigating the sewers too. In addition to being acclimated to darkness, Ninety-Nine's other senses have less difficulty tracking the others' movements around her. She can keep track of where most of them are without even having to look.]