Whichever solution is best. Standing your ground could take many forms for example. It could be teaching you all a lesson, it could be calling the police, it could be leaving and letting you keep taking over like a mischievous zen monk. Who's being led there?
Call the police on someone who won't move?
'Letting' someone do exactly what they want is not leading them; you are having no impact on that person, whatsoever.
"Yeah - you're killing all of those Jewish people, Adolf, but I tell you what i'm gonna do: i'm gonna leave and let you keep doing it, like a mischievous zen monk, lol."