Last season, the speed of the action subsided for an episode in which Brody and Carrie spent a weekend in a country house. The writers need to similarly take the pace down a notch at some point soon, to let the consequences of all the previous episodes sink in. A super-twist is exciting in the moment, for sure. But now that Deb knows about Dexter, “Dexter” has begun to descend back into mediocrity. The “Homeland” writers need to take care of later on, once the initial thrill of a super-twist is gone.