Dragoon time!
Kinda like some of the other quests you take on a pupil, Heustienne (Who is a good Dragoon from what Alberic says), and begin by taking her out on a hunt to start off her training. She notes that, not only are you a better Dragoon as the Azure Dragoon, but the fact that you fight so many different kinds of enemies has givin you a different style from Dragoons in general, making you much better ovefrall then just dragon-slaying. This battle also leads to you learning Battle Litany. Shortly after you also meet her father, who of coruse worries for her.
From there the dragon Graolly attacks, with you and your pupil going off to repel its horde. When it attempts to retreat Heustienne jumps on its back and gets carried away with you unable to make chase. Eventually you and Alberic are able to track her down, only to learn a horrible truth: She was forced off the creatures back practically into the waiting arms of Heritics, who forced her to drink dragon's blood. It will only be a matter of time before she herself succombs.
However she will not submit easily. While initially trying to go it alone for fear of hurting others on her quest to end Graolly before she is turned you eventually join her fully right as the battle is about to begin. It plays out somewhat like the Stone Vigil and, if I remember right, the Snowcloak bosses with certain mechanics even. Ultimely however not only do you vanquish the foe, but Heustienne is able to keep control! Her father and Alberic are of course over joyed...and at this point I forget if she still doesn't return to Ishgard or not, but she does still have ALberic, her father's and your own support. Mayhaps we shall see what holds for her next xpac.