You were Upper Rank 5, Gyokko's replacement, in addition to your Blood Demon Art you also had a Breathing Style, basically you were a hybrid. While you were somewhere in Inifinity Castle, eating low-ranked demons and some humans to get stronger, you heard your door open to detect a Demon Slayer, a Hashira, before you could eat a dying civilian, with immense speed saves him, making sure he is still alive, but then he got killed because of your shots, then Shinobu turns to you unsheathing her Nichirin Blade

"You disgust me, killing humans, how long do you vile demons plan to continue this?"