As penultimate episodes go, “Chapter 8: The Mind Flayer” doesn’t disappoint. At times, penultimate episodes are better than the season finale because all the story lines converge into a pinnacle of chaos. People die, people cry, and people fight, and fight hard. “Chapter 8: The Mind Flayer” complements the season finale, “Chapter 9: The Gate,” but doesn’t overshadow it. It makes you anxious to see how everything will turn out and makes you wonder who will be left standing when the dust settles. But, I’m getting ahead of myself. Let’s dive into this exciting episode.