I started off as an axeman hearthperson in a hamlet that was being harassed by bandits, and my first assignment from my lord was to kill the bandit they sent to harass them. It was a normal assignment, and I went around looking for a Kethi Bleachmourned (which was the name of the bandit). The only problem was that I soon learned that there were 3 Kethi's in the same hamlet.
At first I thought this was a vampire-hunting situation and since there was no option in the dialogue to accuse the person of being a bandit, I assumed I just had to go for it. The poor guy's head flew off in a matter of seconds, spattering the floor and a nearby farmer with innocent blood. I had no idea this wasn't the Kethi I was looking for because I can't view their untranslated name (or if there is a way I haven't found it yet) and when I went back to the lord, I gave my report, only to be surprised that it's still marked as active and there was the added shock of being scolded and spat at.
So I went around looking again, only to find a second Kethi. His unfortunate and unnecessary death went about the same way as the first, only this time with a poor child spectating, and I went back to my lord only to see that the quest was still marked active.
Confused, I began fast traveling to see if I could spot a bandit camp anywhere near our hamlet, because perhaps Kethi went back to his camp. Except I was startled to be ambushed by a group of travelers. I check the names to see if I can find anything and lo-and-behold THIS was the Kethi I was looking for the whole time. That was a very satisfying beheading.
I eventually committed suicide-by-ettin because I wanted to run a character that didn't kill innocents. It was a fun learning experience though.