You lead her to the end of the hallway and pin her against the wall. You tell her that you need to talk and warn her to keep this situation a secret. Shinobu panics immediately and surrenders because she is trapped and has no idea how to react.

"U-Uh what is this? Why are you doing this? I promise I will not say a word about this to anyone. I surrender so please just tell me what you need to say"