In the First Task of Harry Potter and the Goblet of Fire, Harry lures the dragon out of the arena. He then engages the dragon in a tower top duel and eventually causes the dragon to collide with a building. The dragon doesn't return, so Harry returns to the arena on his Firebolt. He is greeted by cheers.
Questions ( based on movie )
What happened to the dragon? Was it killed?
How did the spectators know that Harry had defeated the dragon?