He starts an automated test and gives the stream of summons his full attention, and gets one a moment later.
"Best idea I've come up with so far is you wait here, I go turn myself in, and me and my new co-workers come out in black uniforms and stompy boots to collect you after I've explained."
"Right, right. I'm- Not used to heavy stuff like this. Full disclosure. Daeva in general are fully indestructible to all known attempts at destruction, including things like black holes. And I will go back to fairyland if you want me gone intensely for a full minute, or if you die. I had not and still do not consider it a valid course of action to arrange for that to happen. Fairies move things. Any things, any speed, and I think I can kill any demon that can be killed by physical force, and exile them to the kuiper belt elsewise. I'm pretty sure my Earth is higher-tech than this one, so, science, yay. And I'm trying to think of further relevant non-sensitive information."
"Do I have to go tell the USADI that I found a helpful demon who knows where to find more helpful demons and won't say?"
"I have to think about it. They're probably paranoid enough to be safe about it but I want to watch them being paranoid first. And watertight infosec is hideously difficult and I'm worrying about some unscrupulous new summoner deciding to cause havoc by summoning dozens of unbound daeva. Plenty of daeva are prefectly peaceful and cooperative, but then there are the ones who aren't. Standard practice for rogue daeva on the other Earth is to kill the summoner by any means necessary, up to and including nuclear weapons. I know it would help, but this is not a light decision."
"This is going to be a fun drafting conversation."
"You can tell them that if I see solid evidence that the USADI faces and deals with hostile high-power threats in a responsible manner on a regular basis, I will teach them daeva summoning to the best of my ability. And in the meantime I'm willing to part with whatever technical specs from 2180 or so that my tablet can spit out."
"Highlight of my year, this is going to be," she says. "I'm planning to turn you invisible before I leave, by the way, we're outside of the enclave right now and I'd rather a vampire didn't come along and tangle with you before you've seen some kind of informational slideshow or something. Anything else I should know before I go get stompy boots?"
"You're quite sure?"
"I don't fully trust you either, you could have a way to spoof my fancy lie detection," she says. "But if I waited for total certainty to do anything I'd lie paralyzed in bed all the time. What's your name?"
"Likely more than an hour, and if you want to sit out here being bait for every nasty thing that might walk by in this forest, well, I'd say that's your business and the business of your souped-up telekinesis but I don't think my imminent commanding officer will agree."
"2004. Why don't you want to be invisible?"
"It'd work on a regular demon fine."
"What part of the spell is to prevent you from attracting demon attention makes you think music's a swell idea. Headphones or no headphones. Most of them hear much better than humans do."
"Thank you. They might also smell you or detect warmth or something but I can't do anything about that." She rummages in her bag again. "So your phenomenal telekinesis powers will have to take care of anything like that which comes along."
"We have flashlights. What's special about yours?"
"You have a UV flashlight?? Give it here."