Harry Conjures a Patronus and Drives the Dementors Away

As the Dementors surround Sirius Black and the past versions of Harry and Hermione, Harry realizes that no one else is coming to save them. He steps out of hiding and casts a powerful Patronus, a stag, driving away all the Dementors. The stag, which Harry recognizes as his father's Animagus form, James Potter, leaves a lasting impact on Harry as he begins to understand the deeper connection between himself and his father.