People have read all sorts of things into Rikk's expression here.

We should have focused on Katherine instead—this is really her moment, where she's all too aware of what she's losing and what she's risking, but keeps going anyway to preserve her position—ironically proving herself unfit to lead. Good people, or potentially good people, who do bad things would be a frequently recurring theme for the series, and it probably will be for the rest of my career.