Wei Ying goes quiet, and after the first moment or two his own look turns quizzical at the continued silence.

He doesn't say anything, of course, since to do so would be to break the precepts, but he is a little surprised. Not to mention, he realizes, that he's become used to listening to Wei Ying chatter, even when he himself is silent.

He takes a moment to refill their tea, and continues eating. Maybe Wei Ying is trying to be polite. Maybe he has something on his mind. If so, surely he will not try to hide it.