Hanyuu didn't mind not taking part in the conversation--she was relieved, actually. It kept her from having to answer the earlier question, at the very least. And, to be quite honest, it was what she was used to. Of course, both Archer and Celes knew she was there, so there was no need for her to feel guilty about listening to them talk.

So, she merely took the time to eat her lunch, listening to the two all the while.