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.
Same thing happened with me. After refusing the deal and attacking the hag, upon reaching Mayrina' cage the combat encounter with the hag does not trigger. Could not converse with the Mayrina. I even reached the arcane barrier but no encounter triggered.
https://imgur.com/a/MJKJ1gB