[llevrok]

He was using a Sony pro level camera often used for event photography (such as sports). These modern cameras are essentially motion cameras with many frames per second. You got to get the shot.

I suspect he had his ISO (light sensitivity) set to “auto” and his lens opening to a wide open setting (f1.4?) to get the depth of field he wanted. It's not his first sports or political event. There are no do- overs.

With those kind of settings, it means to balance the light, the shutter speed (frames per second) has to adjust (increase) to balance the light.

[Tellurian]

If his ISO was auto, it probably went to around 800 for that time of day and sunny skies at 41° latitude. For some reason the graphic that accompanies the you-tube video doesn't include ISO among the stats. 800 is high, and begins to be grainy.

The photographer sacrificed what could have been a higher quality picture for the highest shutter speed his camera would give him. Why would a professional photographer sacrifice quality?