Behind Enemy Lines(?)

One of the quests that got updated in the June 15 patch was "Behind Enemy Lines":

* Changed the "Behind Enemy Lines" quest so that Aidan uses the correct model and players have a little more time to follow him.

I don't recall a quest where I had to follow Aidan, and I have played my R/N up to Quarrel Falls (ie all the profession-specific quests are out of the way) and my W/Me through the full game.

The only quest I had to follow Aidan was a quest started by Ivor Trueshot (Piken Square) and I believe that was called "The Charr Reinforcements". Can anyone tell me where and what this quest is?