Thanks! For some reason, my other problem was that I was beating the jouster just a couple tiles south and then went to the mount and nothing was happening.
Then I realized I was in the wrong location and beat the dread knight pretty easily.
So all is good.
PetrusOctavianus: Juror quests? Is that the class specific quests?
You may want to bring along NPCs. If doing the Knight quest, for example, you can bring along all the Knight NPCs as well as all the Robber NPCs, and your own Robber if you have one.
I remember saving up on good items to be able to equip all the NPCs if I needed them, and they came in handy for these quests.
They should be doable at lvl 19, I think. I don't remember what level my characters were when I did them, but when completing the game they were about lvl 32.