It sensed her. The newcomer. The new source of energy, hope and happiness...

It let its sense of smell guide it to look in her direction. This new person was growing happier and happier and it was getting hungrier and hungrier. It stopped in its path and changed course; it was going to go for her, instead. The new source of its next meal...

Before it could do so much as glide a few metres, there was a sudden burst of energy. A blinding white light spread across the area and took the form of a stallion. The patronus charged, ready to protect its conjurer and the victim. The energy was strong enough to wash over you with a sense of hope and happiness. Sensing this, the figure rose and drifted away into the shadows between the tree trunks.

Just when victory looks like it's yours, you hear it. The whimpering voice of the young girl you just saved reaches your ears, "Wh-what was that white thing? What d-did you just do?" She looks to be cowering still, but not from the hooded figure from before. This time, she's cowering from you...