Now I really want to include in my game a vampire nicknamed "Bubbles" who is trapped in a flooded, spinning torroid in some kind of horrid menagerie.I was still trying to figure out how a vampire in mist form can remain under running water.
(In Mist form they'd be immune to the acid damage from submersion, and even though in Mist form they can't enter water, nothing stops confining a Mist form vampire in a space that you then flood. So I think this works.)