Yes, wee need a more options in this quest. One of them is to enlist in the service of demons, knowing that they are demons, and to receive a demonic reward from them and the prospect of further quests. When I tried to talk about knowing their secret, they just attacked, this is not right.
At this stage, the only logical conclusion of the quest is to help the tiefling girl, there is no motivation to help the "paladins"
