It could be a number of things really. The most likely is editing. Yeah, people edit stuff. It could be someone placed a flint in the fill hole for the effect. It could be a piece of stone that got kicked up, or it could be the friction of the chords ripping apart. I honestly don’t believe anything unless I see it myself in person, and even then I’m wary.
Are you talking about a cloud of condensation, it’s water vapor a mini cloud briefly forms as the pressure wave expands basketball example https://m.youtube.com/watch?v=BgRIrixQHvg same can be seen on plane wingtips https://en.m.wikipedia.org/wiki/Wingtip_vortices or bomb explosions and the effect is more visible in high humidity or cool air
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