I'm on Dror now and when I start a fight in his room only the goblins/Elves inside aggro, but once he dies everything else in the castle becomes hostile (goblins don't actively seek you out but combat is initiated on sight- removing all other roleplay options from the area.

Granted it much easier to pick off all the goblins in small packs, but I was hoping there was some sneaky "Hitman-like" way of getting rid of the leaders without the rest of the band becoming aware of it.