It can get confusing during the mind switch storyline when some people refer to Quentin when they really mean Petofi in Quentin's body and Petofi when they really mean Quentin in Petofi's body, but the scene Cassandra was referring to actually took place in Ep #854 before the mind switch was completed - Quentin was still Quentin, but he was already beginning to receive the memories of Petofi. Here's the scene from Robservations:
Kitty, book in hand, closes the window in the drawing room, then puts down the book. Quentin returns. Join me in a drink? she asks--I'm being very forward she is, but I think it would help me to sleep if I had a brandy. "What are you REALLY doing here?" Quentin asks. She turns to look at him--"I beg your pardon?" I wonder why I asked that? says Quentin, puzzled, then adds, yes, of course--Gerald Soames died penniless, and you have come here to marry Edward and all of his money! Kitty is horrified.(http://www.dsboards.com/epimgs/0854-3.jpg)
Quentin laughs at her. She smacks him--stop it! she orders. Why did you hit me? he asks--did I say something?--tell me!! "Quentin, if you don't remember," says Kitty, "neither do I." She leaves him, heading upstairs.
[hall2_smiley]