I started a game of adventurer mode for the first time in a while. I made a standard human, got my gear and companions, and set out into the hamlet in search of a group of outlaws terrorizing the town, led by the dwarf Bethri Closedtower. I found a trio of elves who were not hostile, but openly claimed allegiance to the dwarf. I nearly died, but my companions rescued me and we hunted for the single elf who survived the battle. Instead we found a human bandit who we slew easily.
I found the elf but he escaped before we could fight. I headed for Routedportals, the bandit camp which seemed to be the direction someone the elf was fleeing towards. Outside the camp was a human sentry who I snuck up behind and crippled. The sentry yielded so I decided to try and stop the fight. Typically my companions will kill yielding enemies, but after shouting to drop hostilities it seemed they were content to let me speak with the sentry.
I gleaned little information from them other than confirming they worked for the dwarf Bethri Closedtower. I robbed the sentry of their gold, and afterwards tried to fast travel away. I was unable to, so i decided to speak with the bandit about the value of law in an attempt to convert them. They were having none of it, and apparently my companions grew tired of their refusal to obey the law as they butchered the bandit immediately after.
Attempts to get her to follow me, join me on adventures, and guide me to her leader all failed. My question is what can I do with an enemy who has yielded and is at my mercy, other than demand their valuables (I am thinking weapons so they can't attack me, armor if it fits, and any gems or gold they may have).