"Thank you," Leareth says out loud. He holds his hands loose at his sides, palms open in the most non-threatening posture he can manage (hopefully it signals the same thing here), and does some very quick thinking.
He's obviously never been in exactly this situation, but he's experienced enough vaguely-analogous ones. Normally, he would play it carefully, take his time mapping out the various intricacies, before choosing how to insert himself.
He isn't sure he has that kind of time. More importantly, it's not clear he has leverage in the way he's used to. The Quendi may be inexperienced in some matters, but they're also long-lived - Leareth could be younger than Nelyafinwë for all he knows - and their civilization is, in many ways, clearly more advanced than his. And Nelyafinwë is smart. And, due to the cultural gaps, unpredictable to Leareth.
There are always some moments when the right path, in expectation, is to take a leap of faith.
:I will be forthright with you: he sends. :Your world is a paradise next to mine. And the Quendi I have met so far show the marks of having grown up in paradise. Your people are kinder and far more able to coordinate than the people I have known in my homeland. Yet, I have seen many things in my time: he would say he's older than he appears, except that won't even mean anything to an ageless race, :and the pattern that jumps to my attention, here, is one headed for death and destruction:
He shrugs, slow and deliberate. :Perhaps I am wrong, since your people are different. However. I have spent a very long time trying to improve the state of affairs in my own world. Having observed the flourishing and prosperity in this world - having, for the first time in my life, seen paradise with my own eyes - I am horrified at the prospect that it could be destroyed. I wish to prevent such an outcome. I hope that you might share that goal:
And he waits to see how Nelyafinwë will respond.