¡°It's Okay, Beaky, it's okay¡¡± Hagrid said to Buckbeak. Then he turned to Harry, Ron, and Hermione. ¡°Go on. Get goin'.¡±
At that moment, there was a creak overhead. Something had moved upstairs. Both of them looked up at the ceiling. Hermione's grip on Harry's arm was so tight he was losing feeling in his fingers. He raised his eyebrows at her; she nodded again and let go.
¡°A what?¡± said Harry.
The Prisoner of Azkaban
¡°Harry, I can't believe it¡ You conjured up a Patronus that drove away all those Dementors! That's very, very advanced magic.¡±