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I know zip about photography, could you explain, please?
Oh, this'll blow your mind. Digital cameras don't capture the entire image all at once. They typically capture one row of pixels at a time, so each row comes from a different moment in time.
So the point I was alluding to is that two adjacent frames in a video carry slightly more timing information than they might appear to based on timestamps.
Specifically, if you have two frames where a dot appears at the bottom and then a second dot appears at the top, you can't be 100% certain that the first dot to appear actually showed up first, or whether it's an artifact of the rolling shutter effect.
https://en.wikipedia.org/wiki/Rolling_shutter
I'll check out the wiki, but your explanation is pretty simple to understand and concise! Well done and thanks so much!
ETA: just read it. Those distortions in the propeller and helicopter blades are wild. While not being a fan of car dealerships, I'm also not a fan of insurance companies. It would be fascinating to know the answer to this mystery.