instruction:
Given scene/plot descriptions from movies or TV shows, and given a specific question about the scene, summarize the question into a title
question:
Early in Rogue One, we learn that Galen Erso at one time worked as a scientist for the Empire. Based on this previous experience, Krennic intended to manipulate Erso into rejoining the Empire to work on the Death Star. What lead to Galen Erso to leave the Empire?
answer:
Why did Galen Erso abandon the Empire?

question:
I just started watching Travelers, and I am confused as to why MacLaren died. They saved him from falling down the elevator shaft, therefore he should have lived. But moments later he died for no reason. I assumed that it meant you can't go back in time to save someone's life, but that's the whole premise of the first episode, that they save loads of people from dying.
answer:
Why does MacLaren die in the first episode of Travelers?

question:
As we all know, the most exciting part of seeing a movie is the trailers of upcoming movies before the actual film (note, this is coming from an American point of view, I am uncertain if this occurs in theatres everywhere). However, there doesn't seem to be much of a forethought given to what trailers are shown, besides making sure big movie trailers are shown before other big movies. For instance, the idea of seeing a Dark Knight Rises trailer before Avengers (two different production companies, let alone two rival comic book companies) doesn't seem to make much sense to me. Is there a strict guideline trailers are released controlled by the MPAA or do the theatres have free run of what to show?
answer:
What factors go into determining what trailers are played before movies?