Throughout the Harry Potter movies, Draco Malfoy (portrayed by Tom Felton) is a pure-blood loving bully. Harry and Draco are rivals on the Quidditch team and in real life. Draco is always making fun of Ron's poorness, Hermione's blood status, and Neville's incapability. He is not much more than a rival to Harry until the sixth book, when he becomes more stressed out due to the fact that Voldemort had chosen him to be the one to kill Dumbledore.
However, in the seventh book, when Harry, Ron, and Hermione are captured by Snatchers, Draco has to be the one to tell whether it's the real Harry (due to a Stinging Jinx from Hermione that disfigured his face). Draco saves Harry by telling them that he can't be sure, despite already knowing it is him.
Eventually, Harry repays the favor by saving Draco from a burning down Room of Requirement.
There are still many who hate Draco for all the times he insulted Harry and his friends.
But if you watch this deleted scene from Harry Potter and the Deathly Hallows: Part 2, you'll probably think Draco was a good guy.
Essentially, the scene is the one where after Neville pulls the Sword of Gryffindor out of the Sorting Hat, Harry reveals himself to not be dead and falls out of Hagrid's arms. He then performs the Blasting Curse on Nagini but instead hits several Death Eaters.
The deleted scene shows how Harry got his wand. Draco threw the wand toward him to help him. If he had not done that, Harry would have been killed.
WARNING: The scene contains Voldemort with a nose.
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