Say something a very small voice in his head tells him. But then that voice can't offer up any suggestions for what he should say, and like he did when he was trying to emotionally support Rogue after she nearly murdered him while under William's demon influence, he ... says nothing.

Severus is in the final stages of cooking, but not done yet. Still some poking around to do. He's not sure if Darcy's followup question is mocking or not-- it's hard to tell, sometimes, with her sense of humor, but he's not actually pegged her as someone actively malicious.

"..Do you really want to know?" his tone is wry.