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Originally posted by Extralien
So we are back to the flash being a good inch or two away from the mesh and going in front and above of the wooden beam...
Thank you for your enquiry and what a spooky video clip it is. I guess that you are looking for a ogical scientific answer to this phenomenon which I think I can provide you with although I have to admit it still seems very strange and something I would not expect frankly to ever see.
As a reformed smoker
of advancing years, I recall that I was once the proud owner of a rather
expensive Calibri Quartz Crystal lighter -- this was a quality heavy beast which had a quartz crystal within it that when struck by a small sprung loaded internal striking device produced a significant electrical discharge and spark able to ignite the gas source.
The electrical discharge was so powerful that if I tried to use the cigarette lighter in the rain, I often received a nasty shock rather than the ignition spark hoped for.
Granite if I am not mistaken contains quartz -- if that quartz became compressed by even small structural movement within the granite walls, I guess it could be enough to generate a discharge that would spark towards a conductor or path top earth -- in this case the galvanised steel mesh.
That is my best shot
at a logical solution to this strange spark.