The Duffer brothers can't always keep "Stranger Things" fans happy, but there is a method to their madness.

The series creators were on hand to discuss Season 2 during Vulture Festival LA on Saturday, and fans brought up the most controversial episode yet: Episode 7, "The Lost Sister." It was a chapter -- spoilers ahead! -- that saw Eleven (Millie Bobby Brown) leave Hawkins and embark on new (mis)adventures in the big city with her "sister" of sorts.

The episode was not universally well-received, and it inspired tweets like the following:

Nonetheless, brothers Matt and Ross Duffer had their reasons for Eleven's not-so-popular journey. While Ross admitted that "it annoyed some people," the episode gave them to try "experimenting with form" and to take "a breather" from Hawkins and the Upside Down.

Executive producer Shawn Levy defended the choice, too, pointing out how it furthered the story.

"It allowed Eleven to learn about her powers and gain more -- which we need for episode nine," he said, referencing her training with Eight (Linnea Berthelsen). "Her going away makes that return at the end of episode eight so powerful."

Overall, "Stranger Things" Season 2 got a positive response, so one semi-unpopular episode isn't the end of the world. Besides, there were other people who loved it, including some fans who are ready to see Eight get her own show.

"Stranger Things" Season 2 is available on Netflix.

[via: Deadline]