I'm trying to go through the labyrinth to get back to floor 2, then I can start the horror house. Not sure if there are multiple ways to the labyrinth other than through that room. Rosalie just says "I really don't want to fight that lightning idiot again." So it seems like I have to do the horror house before being able to leave floor 2 legit, and using the release pit in the monster farm to go back broke the game.I don't believe so. What exactly do you want to do inside that room?
Unless I'm missing an obvious alternate way back to floor 2 I'll have to use my previous save and lose about an hour.