If you surrender and you're telling the truth we'll let you leave -

And I should trust you farther than you trust us because...?

I haven't used weaponized area-effect magic in a major population center with no provocation yet today, if we're competing for trustworthiness -

Luthien? I don't want to hurt these people if we don't have to, is their word good?

They're the Kinslayers, that's literally the only thing I know about them - can't bindingly swear over osanwë, you'd have to hear them in person and we currently can't hear -

...bindingly swear?  They can do that?

Your current song isn't going to melt us, right? If we had ears?  Well, if it is, stop it.

And Malak dismisses their spell and they and Lúthien grow ears again.

Celegorm, swear it. Or Lúthien can swear to the purity of our intentions.

I can't hear her. "I swear that if you're representing yourselves truthfully you can leave once we've verified that."

And that you will attempt to verify it as quickly as possible, please tell me you have a healer who can treat that...

"And that that'll be no later than tomorrow when we were helping you leave with all the resources you wanted anyway -" and yes -

You weren't letting her leave please clarify that she is included in this deal.

If she swears she's not working against us, absolutely.

Do you have anyone who still has ears?

"Lúthien, would you be willing to swear that you are not working for or with the Enemy?"

Not within range, there are mind control songs even more dangerous than the ones she's already deployed. 

So are they willing to come listen to an oath or are you just stalling for time? Apart from her trying to escape from being a political hostage do you have any reason to believe she's working against you?

Yes, which I will explain once you back down. "I swear I've been truthful, I swear you have ten seconds to decide -"

Malak laughs, drops their sword, falls to their knees, and puts their hands on their head.

If she's not working with the Enemy and you exploit some loophole I didn't catch to keep her imprisoned, I swear I will break her out again. I can't make that magically binding but I take my oaths seriously.

People come and drag them away from the door. Healers come to grab everyone who's been injured in the fighting - they do eventually ask if either of them require anything -

"We're fine, I think--I am at least. Sorry to cause you so much work." 

Raised eyebrow. Sigh. 

It is in fact a lot of work. And after a while -

"I'm not actually the person you should be talking to, my brother is, but he's more than a day out from here so all I can do is strongly encourage you to go talk with him before you take any more actions that are all but guaranteed to cause several wars. Can you at least verify -"

"I swear we're not working for the Enemy and I don't believe you ever thought we were."

"Of course I didn't. I thought the risk was unacceptably high, which it was even with it unlikely - do you have any idea what happened to Dorthonion, did Beren ever mention -"

Malak has no idea what happened to Dorthonion or who Beren is, so they just watch.

"Yep, he said that the Noldor put a human kingdom on the front lines of their war and then when they lost a battle the whole city was positioned directly in the line of fire and the Noldor seemed very genuine in their grief."