The encounter with Reimond is probably best tackled when you're at least level 15. I didn't bother with saving the Black Ring captives, but I imagine in order to prevent Reimond from killing them, you'd have to incapacitate him almost immediately, and never give him a chance to do anything until he's dead. It's hard to pull that off if you're not at least level 15 (and have some level-15 gear). There are probably ways to cheese it, of course (using Death Fog or some such).
You can try wrapping up the deal with Ryker, and after that progress into either Paradise Down or Bloodmoon Island, before finally coming back for Reimond.
