The same thing sort of happens to Scanthril and other NPC's, as you can just type in "job" to him and he'll get you to get his "associate", and ask again and you'll be asked to kill a stout(
).
The only problem about killing NPC's is the fact that some of them may give you special items if you get really deep into their conversations, or just skip it all like Scanthril. For example Kerielle, the wind-mill woman half-way to the Nymph Lake knew some guy called Amephan or something - not Anephas
. She asks you to retreive his amulet from the crypt, and in return she gives you a special elixir for defeating Xydusa or Elyssia in the Serpent Temple, which apparently protects you from her.
I haven't found any use for the elixir since I had only done the quest this morning
, and I did the Serpent Temple a few days ago.