Yes - there was never anyone else in this mansion.
Other than yourself and those sad souls,
unaware of their own deaths,
that you once possessed and killed, that is.
You watched me prepare incense all by myself in an empty room,
and laughed at me from in there, didn't you?
Didn't you, Mononoke?
A Mononoke whose form changes depending on where it is seen. Such is the Nue.