Greetings from Lithuania.
So after first 3 quite episodes of "Homeland" - "A Flash of Light" delivered best episode in season 6 so far, and we are only 4 episodes into this season so far. It worked as usually in highest possible way in writing, acting and directing. There were some payoffs, and some plot lines that will be more and more interesting to see now. And what i also like from this episode was a link between plot line of this season (Iran) and s main plot line of season 3.
Overall, "A Flash of Light" is one of those episodes after which you kinda want more. "Homeland" season 6 is on a right track so far in my opinion after seeing "A Flash of Light".