Sadde's running.
Not for any particular reason, just because it's faster. He's been meaning to go to one of the capitals for a bit and now, he supposes, is as good a time as any.
And eventually he's not running anymore, because he's close enough to civilisation that someone might spot him. Not that he wouldn't be able to notice them by scent before they saw him, but still. And as he makes his way to the Norway capital at this more leisurely pace, he notices the tiny, shiny key. He walks towards it and picks it up and immediately notices just how magic it is. He can tell by the way the key feels like things, and different things depending on where it is.
He verifies that what the key feels like is consistent in absolute location by waving it around a bit and seeing that the same place always feels the same. "Huh," he murmurs to himself.
He straightens up and thinks. The first obvious thing to try is seeing whether it opens any doors—a universal skeleton key sounds like the kind of thing a magical key could be—but the second obvious thing can be tested right there and then. He pushes the key into thin air with some purpose, as if he wanted to unlock an invisible door, and then turns it, et voilà, the faintest of door-shaped outlines appears before him.
He locks the door, and it disappears. Unlocks it again, and there it is. So he pulls it open and sees—
"I'm not sure? I mean, I did open a couple of portals literally underground, so all that'd accomplish would be that whoever opened the one back home would find solid matter on the other side, or something. If they're a vampire, though, destroying pretty much anything is cake if they're curious about whatever's there. Can you make a basement-dweller you with your kind of indestructibility?"
"Oh, right. Hmmm... I wonder what'd happen to the portal over there if we opened a portal from here that overlaps?"
"Is there a safe way to find out...? If you make a portal, go through, make another one over it, see what happens if you go through that - then you're a bit lost, aren't you?"
"Well, I wouldn't go through the second one, if nothing happens to the first one when the second appears. But hmm, I wonder if I can dismiss you while you're on another universe? That way you could go, and then I'd dismiss you and you'd be back here."
"Sounds like a plan. Do you want to do this before or after we're sure I'm not getting summons while summoned-by-technicality?"
"Okay, but that could still be because a single summoner can't summon the same daeva twice, so it doesn't rule out the possibility that you can still be summoned..."
"This would be easier with another non-daeva to try. I think I want to test the cross-world dismissal first anyway, I can resummon you later and keep you technically summoned while we go do other stuff that doesn't rely on this specifically."
"Uh, anywhere, really." He opens a new door, and there's a rainforest with some unrecognisable plants on the other side.
So he tries, focusing with one part of his brain on the fact that Cam will be gone only for a few seconds, he won't really be gone.
Ack, this is going to tie his brain in such knots.
This time Sadde does not jump to his arms again. He's getting a grip on his vampire love magic, woo! "Okay, now I summon you again and we try with the door locked?"