Probably not the most useful exploit since you can kill the NPC's in WG for the quest.
The quest itself doesn't specifically say they have to be slain in WG though
Yep, i mentioned that is not very usefull exploit but maybe some member can exploit it better.
Quest itself doesnt say to be killed in WG, but you don't get credit at AB or WSG either.
The quest is bugged, I received credit in EoS earlier. Didn't think it was important enough to topic though as Hivetyrant pointed out.