It's a trap in the sense that if he makes a move there is a witness (mom). And she gets to pretend like she didn't understand and thought it was a business meet

It's a trap in the sense that if he makes a move there is a witness (mom). And she gets to pretend like she didn't understand and thought it was a business meeting to further the professional engagement and get the job she wanted. Or he gets to look ridiculous with this person he invited that came along dressed professionally and her mom came too. She can tell the story to all his "friends" and pretend like she just thought it was a "nice gesture". They will read between the lines and see what he was really trying to do. Maybe a few of them will turn to be reporters or bloggers, etc. It didn't quite work out as well in the sense that he got to keep his job. And that's how sexism usually works with powerful people. They get golden parachutes, spend time at "sex addiction retreats for a 1 week" and they are "cured" and so on. But they are usually not punished for their behavior.