Alistair looked at Professor Snape, hesitating for a moment before asking, "Isn't your Patronus a doe? How did it turn into a cloud of silver mist?"
"Was it because of Harry? Just like how you chose to ride the Hogwarts Express this term. Because Harry was on the train and you didn't want him to see your Patronus, that's why it turned into a mist? After all, he is Lily's—"
Professor Snape's face darkened.
Chapter 165