The man on the left was studying a shop window when he was distracted by the noise of the bike coming towards him, the noise of the exhaust magnified by the narrow street and high buildings. Meanwhile, the three jewish gentlemen were having an intense discussion and were totally unaffected by their surroundings, especially the bike. At the same time, the man on the left was more interested (or distracted?) by the bike than by the three men behind him.
The face high up on the building seemed to be laughing at the whole situation.
Taken in narrow side-street in the jewish quarter of Le Marais.