The glitch is welcome though it saves some time.
As per CO super heaven fan guide under no. 4 you do not need to kill the Brigand mobs for the bee-kettle. I disconnected the game after received the Poison Fang and after logging in I ended up in Bird Island from there scrolled tp Dessert City and was able to continue the quest without killing the Brigands.
Either 1 time lucky or a true glitch in this quest.
