So, we killed the Owklbear and (unfortunately) put the cub out of its misery, but then, walking to the back of the cave, 2 of my characters fall to the necrotic miasma. 2 things wrong here: 1. They weren't dead or down, yet something drew them to death. 2. Again, no control of characters' locations after combat MAY have put them out? Anyway, they're dead, no Help works, no Long Rest.. Purgatory. Can't go anywhere from here except reload the last Save.