@twokgrad I wish I had bookmarked it at the time, but I watched a video a couple years ago that a host had taken when he found that about 17 people were staying at his place that had been booked for 4.
He was infuriated, went over and stood there filming them as they all filed out of the house with their gear. Of course they were yelling at him, but although his anger was evident, he just stayed calm and didn’t engage in any screaming match with them.
I thought it was quite brave of him to confront the scene on his own- some of the dudes were big guys. It was obvious that the host was running on anger and adrenaline. For all I know, he might have had some buddies there as back-up, but they weren’t visible or audible on the video.
That’s what an on-the-ground co-host should be prepared to do. Deal with the situation in real time. Airbnb isn’t some savior on a white horse that is going to come boot guests out. They can contact the guest to tell them they need to leave, but the enforcement is up to to the host.