[vbryynsg] Marat-Psycho mashup

the killer approaches Marion Crane as she showers.  when the shower curtain is pulled aside, Marion responds not in terror but greets a seemingly expected colleague and carries on a conversation while naked as if nothing is out of the ordinary.

should the killer be an older woman (Mother) or, gender-flipping both participants in the assassination of Marat, a man (Norman Bates)?  (curiously, the names of both murdered people start with the same 3 letters Mar.)

Marion's conversation is very repugnant (from this universe's Royalist-analogue point of view, of course), and while the killer initially pretends to go along with it, he or she eventually becomes so disgusted that he or she stabs Marion to death.  the surprise other twist is that the killer was the audience surrogate, not Marion.