if you make this mistake, you just might bore your readers to death

I saw the movie LEGION today and thought it was a fun popcorn movie with some great action scenes.

There were also a lot of boring parts.

The movie didn't have enough conflict.

And I'm not talking about the Big Conflict between the people trapped in the diner and the hordes of the possessed who want to exterminate them and kill the unborn child (because the child is The One…). Those scenes were creative and suspenseful. They made the movie.

But in-between the big action scenes, the characters...