This Feldt x Setsuna thing has been hinted at in the opening, but I thought they pulled this one out way too late. Setsuna is the main character, and if they think they can get away with how they rushed the Anew x Lockon 2 thing, they can't.

Don't get me wrong. I prefer Feldt over Marina (at least since the 2nd season started), but they simply developed it too late into the story. A few more interactions a few episodes before would have done this development a lot of good.

Did Setsuna just dump Marina indirectly? He said that they (Marina and him) did not have that kind (romantic) of relationship, to a girl (Feldt) that is practically confessing that she likes him. How can it be interpreted any other way?