When you save the Elf with the Soul Coin from the Assassin BugBear, if you chose to intimidate her as a first dialog option, others options are still available after she give you the coin, including the first one where she tell you she won't give it.
I've noticed a few times in my playthrough that NPCs will repeat dialogues that seem only intended to be gone through once (even to the same player character), so I suspect that this might be one instance of a wider issue.
"You may call it 'nonsense' if you like, but I've heard nonsense, compared with which that would be as sensible as a dictionary!"
