He feels an open summons and lets it grab him -
He heads down the hall in full expectation that the elevator will be waiting for him when he gets there. It is.
And basement!
"D'you suppose it's worth re-summoning the same fellow from earlier?"
"May as well," shrugs Cam, "he seemed nice enough." He makes a sheet of paper that will aim for that specific fairy. "You got a comprehensive summary of events, huh?"
He locates a writing instrument, takes the sheet of paper, and begins copying the diagram onto a clean patch of floor.
"Noted. Unrelatedly, what's your opinion on how likely I am to get shot at or summon a SWAT team or whatever if I go flying around at night?"
"Hmm. I could offer decent advice if you were going to be wandering on the ground - take a laser pointer, is the main thing - but I lack the relevant experience in the air," he says thoughtfully as he works. "Perhaps you'd be fine. Perhaps you'd attract hostile attention of some kind. Can't be sure until you try it."
"I'm indestructible versus conventional forms of destruction but I don't know how that will hold against, say, weird offworld magic."
Circle complete!
Here is that one fairy! "Hi again! You want me to take more cookies off your hands?"
Cam smirks and hands over the cookies.
"Awesome," says the fairy, batting his wings.
And the unsummoning should be taking hold right about - now.
"That and I didn't feel like taking the time to explain."
"Fair enough. So, now, you too may possibly if it works that way become a daeva one day."
"Very comforting. Although I will be ever so much more comforted if you assist us in backing up Jarvis to multiple locations."
"Oh, yes. The main trouble is convincing Jarvis that it's worth duplicating him to Mars. I don't suppose they have instantaneous communications in the future?"
"It's the lightspeed delay that's deterring me," Jarvis explains. "A few milliseconds here or there is acceptable, but twenty minutes would be an unpleasant discontinuity. And Sherlock seems to think that confining my backups to a single planet would be insufficiently secure."
"We don't have faster than light communications, no. Sorry to disappoint. Not a thing you can do with magic?"
"Can be done with magic - yes. Can be done with magic, by me, systematically and reliably enough to hang my internal communications on - not presently. I'm working on it."