What does the localization of the momentary blackout phenomenon suggest about its possible cause?

Answer

It might be highly localized, perhaps related to a very specific, small-scale anomaly in light transmission

The observation that some nearby companions witnessed the event while others slightly further away did not suggests the effect is highly localized, possibly concentrating around the observers' immediate environment or light transmission path.

What does the localization of the momentary blackout phenomenon suggest about its possible cause?
Darknessweatherskyatmospherephenomenon