Malak steps in, closes the door partway behind them--enough to block line of sight to the guards but not sound.
"Hi. I'm sorry, I couldn't think of any plan within the next few months that could save anyone instead of just getting more people killed. And I think I have to leave here for a while because all the elves around are driving me up the wall and I need some time to learn to shield my thoughts and get a bit more comfortable being around a bunch of telepaths. I'd still like to talk to you, though--I don't know how often messengers will go between where I am and here, but we can write letters and keep planning and maybe figure out something that works. Here, I wrote down instructions for how to encrypt or decrypt messages so that nobody else can read them, and here's a key at the top--It's not the same one I gave to Curufin so he won't be able to read them, you should probably memorize it then destroy it--" Malak shows Lúthien a piece of paper, which reads:
You will have twenty-five minutes. Go to my room and wait for me there.
And features a map of the parts of Nargothrond that Malak had visited last night, with a path marked between Lúthien's room and Malak's.