"Um, oh. Yikes. Okay, so, I don't know how long it will take a Quendi-swift to have trouble with maneuvering from hunger or thirst; I can apply another batch of healing spells but on those fronts all it can do is get you to 'not starving or dying of thirst right now' and that's below the level my species at least finds hunger impairing. Did you get noticeably hungry or sluggish or anything the last three days?"
Snort. "Well, I have no such fallback assumption, so I honestly don't know if you'll faint mid-flight if you don't eat anything, but if you didn't notice any deterioration over these three days another three days probably isn't going to be the fatal tipping point. Maybe don't fly over the forest with the giant spiders. But if you prefer to be a bird I'll turn you back into a bird."
And she tucks her notes away and flies to the Fëanorian camp.
She lands at the entrance as usual. "Hello. No new orcs today?"
She turns invisible and heads in towards the workshop.
"Um, what happened and why did the guard think I ought to be invisible?"
"Oh," he says, looking up, "that. I wanted to show you the electricity first. We're practically cheating with this one - it's not really producing light, just getting metal so hot that it glows. I have ideas for how to do better than that, but we thought first we'd build a continual power source - you can stop cranking that, Moryo, I want the wires to give this a try - and the obvious continual power source is the rivers that feed Lake Mithrim, but the electricity dissipates if you try to generate it there and then, say, light one of the greenhouses with plants from Valinor which would benefit from continual light - we think if we cover the wires, that won't happen, but the things we've tried so far aren't helping..."
"Well, I'm very impressed and I'm not actually sure that isn't how lightbulbs are supposed to work, at least one kind of them, although I suppose it might seem like it couldn't be right since you see heat. What have you tried for covering the wires?"
"Oh, I should have warned you about water, is everyone okay? Is there no rubber available?"
"It's... plant-derived in its nonsynthetic form but I couldn't begin to tell you what the tree looks like or how one turns the relevant tree into rubber. Likewise I don't know how to synthesize it. But it's like -" Osanwë is really so useful, she can just wad up sense impressions of "this is how rubber" and lob them at people.
"Wax might work. Why am I invisible and everybody outside armored, what happened?"