The arrival of Firenze the Centaur did not go unnoticed by the other students—or rather, the Headmaster had never intended to keep the matter a secret in the first place.
At the time, when Umbridge had caught sight of Firenze standing on the stone steps, her eyes had nearly popped out of her head, serving as a living textbook definition of sheer dumbfounding.
She clearly had never imagined that Dumbledore would actually recruit a centaur to teach Divination.
Chapter 968