Now that Narcissa Black is gone, the hesitance Severus displayed in discussing his business with her is no longer an inhibiting factor. He gives a slight tilt of his head - yes, met her - and considers his own words carefully before replying.

"We played a very convincing game of not remembering one another, but I suspect it was more out of consideration - she for my feelings, and me for..." Well. Not hers. Lucius's, perhaps. He leaves the thought unfinished. "She looked as she did when you married her."

Or someone like Lucius, is the implication here. He's not certain which one would have been more polite.