Can you teleport outside? Sure.
Is it safe? So long as there's no rain to smudge your diagram it's basically as safe as doing it indoors. And in Lucien's defense there wasn't any rain at all, right up until the last sylabble of the incantation.
"I don't think I've ever had to resurrect the same person more than once so far but there's no reason it wouldn't. I can't restore in-progress pregnancies."
"I can do human resurrection - it just requires the death of too many sapient people to be worth it generally."
"...oh. Well, then I guess if you had a demon and a bunch of Elves and a Silmaril you'd be all set, but I did not bring a Silmaril here.
- just humans?"
"I am probably against resurrecting evil gods but otherwise I am happy to help resurrect them."
"Not the evil ones. The evil ones are alive. It's - it's what he wanted more than everything else."
"You can see a copy of the oath I got from him and his, if you want. - they can make binding oaths and I can verify that they did that."
He finishes reading.
"Oh, wow."
"This seems like it must have been an excruciating decision. Um. I'm pretty sure we can get them all back and it won't void the deal it looks like?"
"Yeah. Really bad. I don't know if you even have context to understand the magnitude, it involves a lot of computers."
"The reason I can resurrect the Elves is because they have brain chips - not like mine, chips that store their whole personality and all their memories for them. And that also mattered to Melkor. He could take those chips, if he captured somebody. Copy them. Edit them. Make them have experiences without bodies to have them with. Any experiences he wanted. Faster than they would have been able to normally. He had trillions of them."
Lucien attempts to wrap his mind around a million instances of this. And then multiply that by a million. It doesn't really work.
"Ah. ....I'm glad he can't do that anymore."