Celeste tried to just focus on her work rather than paying attention to the fact that Bane was sitting across the room from her. He was busy focusing on some paperwork that he had brought him, but it was evident by the radius in which people avoided the tables around him that he was still in a bad mood.
She would have worried it had something to do with her if not for the fact that he had offered such a generous tip. Generally people who were upset with others didn't do that kind of thing, right? Plus, from what she could see it seemed like he was directing it towards Diana who seemed completely oblivious to it until after she was denied the right to make coffee for him.
