She had a healthy quip, she really did. But he squeezed her shoulder, and that halted everything she had been about to say on her tongue. He didn't strike her as an overly affectionate sort of man. And that squeeze felt like it could have almost been a hug. So the smart ass reply died before it could be born.
"Alright. I'll be more careful. But look, the surface is still, and you can see my reflection and yours. It is our true faces. Everything else, despite what they look like outwardly, if you look at their reflection you will see what they really are." And if they didn't have a reflection? They were just one of his illusions.