Loki waits, although she suspects that an oath with loopholes like that wouldn't've held.
"Yes, he's the one who came up with the way around - or through - the orcs' oath. Though that was given the wording of it. But it looks like she can tell you that she can't tell you things, which suggests imperfect information security... Can you tell us who you didn't think you were talking to when this plan was cooked up, Sarpalarë? List some people who it wasn't."
"Maybe you can list letters their name doesn't start with, even."
"Oh. Well, that's unhelpful. Unless there's someone around who refuses to render their name in written form, or we're on the wrong track altogether."
"Do you have names for the vowels, even if they aren't written?"
"I might." She pulls out her notes on Dorean's alphabet. Has it got vowels?
"Oh, look at that, I had an alternate alphabet in my pocket. Here's how you spell Irissë's name in it - Artanis's -" She goes on with the rest of the vowel-beginning names she can think of. "Care to continue your list?"
"Okay, so it starts with a vowel but not the same vowel as Irissë's," Loki puts the alphabet away. "Anybody else have ideas for how to distinguish people by process of elimination?"
"...Feel free to call Irissë a fool or something," Loki says to Sarpalarë, "or conspicuously don't."
"Why send anyone today, when you seem thoroughly stuck and we had nothing to go off? Were they trying to make sure you obeyed? But if you have no choice, why bother? Were they worried the truth would come out some other way? Were they trying to see to it that a partial truth came out, that my cousin was implicated?"
"Well, the truth did come out some other way; even without figuring out all the details and noticing the shapeshifter we were sure something was going on and weren't satisfied with 'Sarpalarë did it'. If they have a source of information, knew that I was messing with things..."