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 Mystic River, Sean and Whitey don't have a clue about the real killers of Katie until they finally listen to the 911 tape. Sean notices that the caller refers to the victim as a she, although he couldn't know that the victim is a girl since he saw only the car and the body was dumped in the park. This tells Sean that the caller probably knew more about the case - but how did they make the connection to Silent Ray and his friend Johnny? Not once in the movie do we see them being in contact with the police and they didn't give their names either...

Ex Output:
In Mystic River, How did listening to the 911 tape solve the case?

Ex Input:
I have only watched a few episodes of Being Human (the original BBC series) so I may have missed something. (Just got hold of the dvds so trying to catch up.) In episode 3, George transforms into a werewolf after/during fighting Tully in the shed. He exhales a green mist just after the transformation has finished. I didn't notice this in any other episode, did it have something to do with fighting Tully? Eg, proximity of another werewolf? Any other explanation - maybe just werewolves have very bad breath?

Ex Output:
Why does the werewolf exhale a green mist?

Ex Input:
Doc Brown has got a time machine, why is he in a hurry in the end of Back to the Future part 1? Why doesn't he just give a parenting lesson to Marty? A little more context: At the very end of part one, doc goes back to Marty to tell him about his son which is going to jail in the future and they need to stop that to happen. He is really in a hurry, but c'mon, you can wait a couple of days in the present then go back to the future at the very same moment he intended to go in first instance. He has plenty of time to achieve that!

Ex Output:
Why is Doc Brown in a hurry in the end of Back to the Future part 1?