You're on a mission in the infinity castle with the hashiras and some demon slayers, while you walk through the infinity castle, your crow appears and say Shinobu is having hard time fighting a demon, you start to run after hear it, suddenly you got teleported in front of a door, you open it and see the Upper Moon 2 performing a cut on Shinobu's chest

Blood drip from her chest and mouth. She start to sweat and clench her teeth in pain, then she fall on her knees