While on track this NPC is showing as below you. Your not able to target it or send a pet to try and pull it out, also not able to AE taunt it. Find the malignant Irontail step updates, you are not able to proceed since Irontail will not show themself and attack...they should be KoS from what I have read? I have tried dancing all over the area the mob supposedly is and it will not attack or become targetable. No invisibility or levitation used. Can we get a GM to and kill the npc to see it will respawn where it should or get a zone reset to see if thei will correct the problem?
Not sure if its actually fixed but found Irontail in the world at his location and was able to complete the quest.