Jim nods, taking that all in. "So. Different universes, different kinds of vampires, and only some are affected by holy water. Gotcha."

It occurs to him that he should have checked, maybe, if there were vampires or other beings susceptible to holy water before he went traipsing all over the lobby with it. Definitely time to rig up a hose or something, before he caused any problems.

"Would the best approach, then, in the field, be to start with one and move on to the next thing that might affect them if the first doesn't work? Or is there a standard try-this-first?"