Not sure about this at all, but the Empress and Knight could stand for the potential couple in question or their approach to a love situation. The Knight of Swords seems to me an argumentative/combative kind of person; the Empress giving, loving, nurturing (not a good match perhaps?). Or their potential future might be full of quarrels, but as I say I'm not sure. Perhaps you should try one of the realtionship spreads here on the forum. 3 cards don't give an awful lot of insight.