"So I should go test the healing spells on your cousins."
"I'd expect it to be more situational than that - like, if Angband attacked and we were fighting alongside Nolofinwë's host, I'd expect anything I could do for them to work fine even if my personal feelings towards them were adversarial. If they attacked us, then no, shouldn't work, though I'd actually add in a theme specifically about repairing old wounds or about family turning enemy respectively to make it clear to the song."
"So I should go catch an orc, test the spell on it, and convert it only after that?"
"Is the distinction in fact friendly or is it more like allied or appropriate healing target or what?"
"I suppose I do have a purely at-will backup if I want to heal somebody you would feel inclined to stab."
"I don't mean your cousins, or at least I don't mean them right now, but something might come up, I do keep meeting all kinds of people. Hey, is there any reason I shouldn't just run this spell basically all the time? I can spellcraft at the speed of thought, I don't have to move."
"Well, what amount of use is known to be safe, and would you like a time-acceleration room set up so people who are less linchpin-y than I am can play with it?"
"And I assume I'll need more sleep than you, but still, I'd already have the ability to do without sleep altogether if I could have covertly used it in Asgard. How abruptly?"
"About eight times longer than you should have gone, your thoughts get foggy and you feel jittery like you're being sustained by external strings. As soon as you close your eyes at that point you will sleep for a few days, and if someone tries to wake you before then you will have something resembling a very bad hangover and also still be exhausted." A rueful smile. "The sample size is quite large, but all the tests were on me."
"But I could skip a night to get somewhere distant faster?"
Record record record. She will ask when he's done if the snowflake thing is essential.
"As with everything I will be more generally disseminating these things, but sure. What's with the snowflake thing?"
They all have associated physical effects, either chosen because they seemed thematically appropriate to me or because it was hard to design the song without them. Or some of them it's the point, like a song to knock people away from you."
"In particular I feel very awkward about giving you a skip-a-night-of-sleep-room and a speed-up-perception-room and not offering commensurate benefits to your cousins. I feel awkward about it anyway because your host is so much better able to leverage basically anything I offer, but still. I can dismiss illusions from existence remotely even though I can't usefully create them that way, anyway, if another Balrog gets dropped on their camp and commandeers their spell rooms as soon as I find out the room will cease to have special properties."