Hi.
I've gone through the swamps, fought Ethel until she runs through the fireplace, followed her, killed her masked minions and crossed the gas pits. Once I see Mayrina in the floating cage something strange happens. I get the cage down, and Mayrina gets out, but I cannot talk to her for some reason and nothing else happens. I can go to the next room and get out of the swamps and nothing happens. No clue where Ethel is. Seems to me that talking to Mayrina should trigger something.