Cam is dipping a grilled cheese sandwich into a bowl of tomato soup when he feels the summons. He goes ahead and grabs it. Doesn't even drop the sandwich.
He is in a room in a dark, drafty house. Candles are set at the corners of what appear to be a pentagram set into the circle. The other two people in the room are a balding man in a grey cloak holding a rusty knife and a young woman tied to some sort of makeshift altar. Grey Cloak looks startled; Young Woman looks bored. Grey Cloak is holding a piece of chalk that he looks to have just completed the circle with.
"Did I summon in on your theme LARP? You need to be more careful about what you draw on the floor in your theme LARPs. Draw on the wall or something instead."
The fellow in the gray cloak falls over unconscious. The ropes snap.
"Cam. Yours? And what exactly were you planning to spend half an hour doing?"
"Well, that... might have worked, if he's dumb enough to doodle on the floor."
"It, uh, sometimes summons unbound demons." He wiggles a wing at her.
"You do seem to consider it pretty old hat. I mean, most things you can draw on the floor won't summon demons and some would get angels or fairies instead, but it's a good general precaution, no drawing on level surfaces."
"...People have been routinely, openly summoning daeva, demons least often of the three, for more than a century and a half."
"Well, what year is it, at this point I can't necessarily rule it out..."
"Yep, I'm a time traveling demon, daeva are all very secret still - although it would be mildly weird if you'd heard of demon summonings and not the other two even so."
"You say you're a serial horror movie protagonist as though this is what the career counselor told you in eleventh grade."