the host should have immediately call the cops to vacate the property As someone who has been in a similar situation before, the line you will get from any cop

the host should have immediately call the cops to vacate the property As someone who has been in a similar situation before, the line you will get from any cop is, "This is a civil matter." And the cop is right. Police officers aren't equipped to determine who is right and wrong in a dispute among two parties when one of the parties isn't clearly violating the law. That's what courts are for.