i think Bish would have given you a minor Quest and i believe you got a good weapon off him after killing him?
You could have done several "Chores" for krystal and earned some good XP.
I killed Sharegrave also, no problems there that i can remember.
If you've left the Mausoleum this late it should be a doddle. <img src="/ubbthreads/images/graemlins/biggrin.gif" alt="" />
Drink Up Ye Cider. 
