A couple enter a restaurant. As they walk past the bar on the way to the restaurant area, three men at the bar begin to talk about the woman's perfume, speculating on what brand it is.
A waiter seats the the couple at a table. Almost immediately, one of the three men goes up to the woman, and asks her about her perfume. She answers and the man slips away. When the waiter next appears at the table, the woman, still baffled (to say the least) asks him who the man is. He replies that the man is not a member of staff, but a regular customer.
It turns out that the manager of the restaurant was one of the three men speculating about the woman's perfume.
As a witness to this event, what should I have done? Should my reaction be coloured by the knowledge that the daughter of a friend had found it extremely difficult to get rid of this man some years ago, to the extent that she had to threaten to go to the police?