@Kelly1553 its hot air. The guest got caught. When people get caught breaking rules a typical go to is "I will sue." You can probably hear my eyes rolling.
This guest is trying to intimidate you into not leaving an honest review, but you owe your fellow hosts one. I would do something simple that does not violate any policies calling for its removal. Like the following:
"This guest arrived with additional people beyond what was listed on the reservation, tampered with exterior security cameras and threw a gathering in our no parties space. Communication was aggressive, house rules not followed and the reservation ended early. Extra cleaning was needed. This is not a guest we recommend or would welcome back."
Then do below 3s in all categories and select "would not host again." Your guest can only see your forward facing review and not your star ratings or that you would not host them. This will prevent them from using instant book. They will have to request a reservation in the future, giving other hosts time to check out their scores.
Wait until the 11th hour to leave your review. They can leave theirs anytime..let them. Both people have to leave reviews for them to go live before 14 days. If you wait, other reviews you might get in the meantime will be on top of this poor review (because I am sure they will blast you.) Be ready to respond to their review with the same sort of factual, unemotional message that you left in their review. And if their review uses profanity you may be able to get it removed.
Next time vet your guests better 🙂 Come to the forum for advice, use the Host Circle for non-searchable delicate situations. Best of luck!