"Atmospheric shockwave distorting the light"???
Explosions change the density of the air around them. This causes light passing through the air to distort. It is this distortion that caused the lamp light to appear to flare. https://www.americanscientist.org/article/high-speed-imaging-of-shock-waves-explosions-and-gunshots
Have you seen a photo or video that illustrates that?
This article describes a situation that causes different refractive index than the surrounding air, and therefore merely ++bends the light++ like a swimming pool. Notice also the waves in the air discharge //outward from the source// and it is spherical in shape from the source of bang.
This can be witnessed in split second using very fast film which temporarily looks like this:
https://www.americanscientist.org/sites/americanscientist.org/files/2005125111210_846.jpg
What we observe, however, is that a nearby street lamp brightens: its candlelight power increases to an extremely bright light. The spherical enlargement radiates outward from itself (not the source of the bang) This is observed occurring simultaneously.
The shape of the air density will cause a lensing effect. It won't be a perfect sphere because there is a stone monument between the source and the camera that will deform that shape. Even if the cause was lightning, the shockwave will still be present and have an effect that will be visible in other bright areas of the footage though they will be less apparent because they aren't an isolated point source. That lamp may be led and not a hot wire in a vacuum. You need to determine which to support your em induced current hypothesis.
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