So two people two rows back apparently caught it. What of the people the row back? In front?
It was just probably transmitted in the aerobridge boarding or more likely during the “as soon as the belts sign is off, let’s all stand crowded in the aisle as wait 5 mins until the jam of pax starts moving towards the front exit” period.
I’m not saying the risk is nil. It’s that the likelihood is lower than other aspects of the flight that people ignore.