You run around the Infinity Castle to try and find Shinobi. Once you do, to your horror you see Shinobu getting absorbed by Upper Moon 2, Douma. Before Shinobu was fully absorbed, she gave you a hand signal

*This enrages you and so you try to slash him, but he moves quickly so you couldn't get him in time

"Don't slash me while I'm in the middle of Absorbing please" he says