Naz'jar Battlemaiden and quest arrow
 

On all three of the Naz'jar Battlemaiden vision quests the waypoint arrow pointed to the quest COMPLETION area, and not to where you had to go to start the vision quest. This made it quite difficult to find the starting points for these quests.

That is because the quest naturally points you to where the quest objective is gained, as with all other quests.

I'm pretty sure Haavok or Faatal can add a manual "fake objective" though, I seem to recall an Argent Tournament daily whereas you had to kill a fire elemental for an item and then use that item on a frozen nymph - the fire elemental had no objective of its own but was still given an uncompletable objective point.