So what happened/what is happening? I'm in a similar situation right now as I type. Did your guest leave? Did you intervene?
I was just on the phone with AB&B. They seem to be pursuing this on their end, trying to cancel these 3rd party guest's reservation, but ultimately I am the one who deals with the fallout. I'm certain these folks won't leave just because AB&B is asking them to, or at the very least they won't leave without a fight.
I, too, am afraid to continue hosting. But for now I'm just wanting this over.