The mines do not change color when Canach rearms them, causing green mines to blow up in your face.
After Canach is defeated Ellen Kiel runs in, they have a short conversation and then… Canach runs back, regenerates to full health and is just being smug when you talk to him.
If you go back to the entrance the dialogue between Marcela and Ellen resets.
edit:
The patch fixed most of this. I guess it wasn’t supposed to be open