Reading through the comments and reviewing the video does indeed point to arcing power lines. Ive seen videos of fast moving arcs across medium voltage lines that looked like a horizontal jacobs ladder. The lines over current protection equipment might not instantly trip as the current might be limited by enough impedance in the equipment. Disappointing reveal.
Just a few days ago, when those sprite pictures and videos first made their rounds, I thought about ball lightnings. Back in the 90ies I had a physics teacher that was obsessed with them because he saw one as a child.
I figured, with the advent of cameras everywhere we would have much more evidence of them by now, but I found almost nothing.
