You track the mysterious woman that stole your Tanto back to the Shredder’s old lair. After a bit of conversation between you and Karai she smirks at you as you ask for your Tanto back from Shinigami. She says-

“Hmm, If you want it back, Take it from her. I mean shouldn’t be hard for a Kunoichi, right?

She says that cockily. Shinigami smirks at you. As Karai hands her your Tanto. Shinigami slides down the side of the staircase that leads up to the throne and gets into a fighting stance.