Some of the details are different from my hazy memory, but this is surely the one I'm thinking of, thanks. I can't actually find any non-copywrited clips on youtube so I can't check it out myself, but based on the description it still sounds unfair to me. Dungeoneers are supposed to be noble, and if someone can't offer you something concrete in return you help them anyway on the basis your generosity will bear fruit later (maybe Maldane comes and distracts Lord Feare right as he's about to vaporise you, enabling you to escape) An alternative conversation and death that I wouldn't consider unfair:
(team needs to free Malderne, if they do she'll save them later but the character "Malderne" doesn't know that now so cannot bargain with that knowledge)
"Please free me"
"What will you give us"
"nothing"
"Really, nothing, then why should we help you?"
"I thought Dungeoneers were supposed to be noble. Begone, I'll find someone else!"
"OK we'll help you"
"Bah, too late, leave!"
Ending in death at the end even if the team recants. Tregaurd telling them off for being too mercenary. Requiring a team to ask twice to get a reward is not right in my opinion.