Bork

So, I turned in Stormwind Rendezvous and the moment I completed the quest, another player started The Great Masquerade, which made the quest NPC follow that person as part of the escort, thus making me unable to start the quest myself. He hasn't spawned yet, so do I just have to wait or what am I gonna do? It's kinda important for me to initiate the quest. Edit: It's been 55 minutes, hasn't respawned yet. The NPC's name is Reginald Windsor.