You really did not miss anything, by not being able to report to Ragnar. Don't even think you get any EXP for doing it, he just says thank you and we may use you again and that's it. No more quests or anything if you met Janea already in random encounter (daylight robbery) then that is the only other quest he would of gave you.
Thing I always wanted to know is if you save (con) the prisoner to lead you to their camp but side against Janea how the bandits would react when you went to their camp.
I just left the guards standing outside the bandit camp for the rest of the game (hope they had their gas masks :-D) as there is nothing to gain by raiding it anyways. No EXP or anything.
