Given scene/plot descriptions from movies or TV shows, and given a specific question about the scene, summarize the question into a title

Ex Input:
In the television series "Arrow", how come Oliver Queen doesn't rescue Walter sooner than he did?

Ex Output:
Why didn't Oliver Queen rescue Walter sooner than he did?

Ex Input:
In Iron Man 2 (2010), Whiplash (the villain) enters as a track marshal during a race on the Grand Monaco Racing Track, unleashing his weapons on Tony Stark when he's most vulnerable. But, Tony only decided to race the Stark car minutes before the race, which Whiplash couldn't have known. Was he able to predict that it was going to happen or is he that lucky? Then, how could Whiplash come so prepared without knowing that?

Ex Output:
How did Whiplash know that Tony Stark is going to the racing track?

Ex Input:
In the movie Deathly Hallows Part 1, Harry Potter did not disguise himself using polyjuice potion at the wedding of Bill and Fleur. But in the book he was disguised as a cousin of the Weasleys, Barny Weasley, because there were threats. Shouldn't he have disguised himself, as Death Eaters might be around looking for him? Why did they not take that matter seriously in the movie?

Ex Output:
Why did Harry not use Polyjuice Potion at the wedding of Bill and Fleur?