There is a book held open with a rock and a wooden stake; and next to it a messenger bag; and beside these a teenage girl, painting goat blood onto the floor of a crypt.
"That's one way of putting it. How much trouble am I likely to get in if I wander around town until morning?"
"Vampire may try to eat you, some kind of demon-in-local-parlance-meaning-catchall-supernatural-thingy may try to eat you. If you can fly you're probably good, honestly."
"Good. If I happen to make a mess, is there any particular manner in which you'd like me to dispose of it?"
"Vampires just turn into dust, demons are often nearly as self-disposing, but if you do find one that leaves a corpse keep it off the sidewalk and people's lawns and out of the middle of the road?"
"Simple enough. It would probably be wise to set up a way for us to contact each other before we part ways."
"And even if I had one of my own, it would be unlikely to work here. Perhaps a dead drop? Is this, ah, crypt accessible enough?"
"Yeah, I stash things here and occasionally fail to get magic to work here too, I can check it now and then."
"That depends on how close a tab you wish to keep on me. I expect to be traveling frequently and extensively, but returning on a regular basis to keep you apprised should pose no difficulty."
"I will sort of feel responsible if my magical accident leads to anything unfortunate, so routine check-ins would be a load off my mind."
"...that'll probably do but I think I actually want to do more comparisons of respective Earths before you go zoom off, if you're from 1964 or something that's another set of things I might have to warn you about."
"I am... conversant with it? This is around the time Revelation occurred, I read a book about the social milieu of the era several years ago."
"When knowledge of summoning was publicized. Prior to that, it had been a very closely guarded secret. It was an exciting time, by all accounts."
"No other supernatural entities chose that moment to reveal themselves, and I've come across no hints of any since."