How do the events occur in the variation "Retrograde?"

The events in the variation "Retrograde" begin with the young man getting advice from his friend about the placement of a button on his overcoat. The young man is then taking a vacant seat on the bus after having had an argument with the second man. The young man is then described as wearing a ridiculous hat, and the variation ends by explaining that this all occurred on the platform of a full S bus at midday.