Turn it over to you. The point of involving me in this process at all is to minimize his distress to the reduced extent I can.
So Loki goes in and finds a Dwarf who will ask Maitimo if he is willing to receive her for some of what's left of her various bidding war proceeds.
And she goes to Macalaurë and says, "Wave your hand or something when you're done with the part I'm not supposed to understand and I can loop and baffle it." And turns her Allspeak off.
"Father says as follows: 'Loki's productivity might be unaffected by whether you're being tortured, but mine isn't, and you don't have leave to turn yourself over to the Enemy no matter what good you think it achieves. I didn't say this sooner because now you're probably even more inclined to mislead us about how well you're doing, but now it seems necessary so now you have it. We're going after Thauron. You're to join the party, since Thauron claims he can track you; you needn't speak to or acknowledge them. Stay out of the fighting but if there are no survivors notify someone who can notify me."
And when he waves at her Loki loops-and-baffles and turns her translation back on. "Here goes," she sighs, and she heads for his place.
"I can soundproof his apartment and then have a conversation about going for a fly which could plausibly segue after that into kidnapping," she suggests.
"I'm sorry, first of all. Again. Since you threatened to go catatonic if anybody from your family spoke to you I've got a recorded message from Macalaurë which I took down and will play with my Allspeak off." She soundproofs the place, detranslates herself, unbaffles the loop and scoots it back to the beginning.
"We're supposed to have a conversation that makes it look to any local espionage that I'm convincing you to go out for a recreational flight so that I can switch to kidnapping later once we're out of your room, which I had soundproofed."
"We are going to leave your room and then fake the conversation on the way out."