The latest episode of Legion wasn’t just the most impressive installment yet. It also transported us fully to the place known as the astral plane, a location that we’ve seen pieces of before, but never so in-depth and with such evocative imagery. While there, David has an intense conversation with Oliver (or rather, what may or may not be the real Oliver), who explains to him the nature of his problem—including the “parasite” we know as the Yellow-Eyed Demon. A.V. Club staffers Alex McLevy, Laura Browning, and Cameron Scheetz break down the nature of this new development, asking whether it succeeds as fully as the rest of the episode. As with most things Legion, the answer is far from clear.