Fin sat back in his seat and let the silence lengthen. here really didn't seem to be much one could say under these circumstances.
The questions he really wanted to ask - for instance, does this kind of thing happen often? - would be best led up to gradually.
In fact it wasn't until Katie had brought their food and was pulling on her coat and enlisting the help of the bar man and a couple of the cooks to carry the food out to the work force, that he spoke again and that was just to say, "Mmm, soup. This is touching the spot."