Just make 100% sure that you hail all the NPCs in the order you blow up the walls. You will know you have done it right because they all run out of the zone in turn once you hail the last. Run around and make sure there are no NPCs in any of the rooms and you will be fine.
A little tip for blowing up the walls.... When picking up the barrel there are two choice "Ignite" and "Move" . Make sure you are at a good distance from the barrel when picking it up so that only "move" is clickable and you cant accidentally hit "ignite".
Good luck with Malconis
