It was mentioned that Fawkes was in the room. Maybe Harry threatens the chamber with having Fawkes teleport him to Azkaban and destroying all the dementors after demonstrating on the one in the room.
It was mentioned that Fawkes was in the room. Maybe Harry threatens the chamber with having Fawkes teleport him to Azkaban and destroying all the dementors after demonstrating on the one in the room.