Something of a Boss fight

well here she is, Lucy. my lil boss..... ignore that
she's a boss you'll meet in a game similiar to "The Grudge" or anything of that calibur.
I guess Umbrella Man is trying to figure out the sudden disappearances of many teenagers across the city (I have no idea who he is or what he does so he'll play detective) and he comes across Lucy.
you'll meet her around the middle, to learn a pivoting secret you'll need to ascend the stairs behind her.
she is a murderer, but not responsible for all the deaths, some but not all.
you won't kill her, but wound her enough that she'll run and you'll see her later on right near the end.
this is indeed related to the Slenderman mytho, why? because there needs to be a goddamn game i can play >