While human interpretation is handy in our daily life as the brain complete, and interpret things it didn't get enough data to have a clear vision, and try to relate to what's normal to it, this interpretation can mislead people badly, and it is the case, here, that either a wave due to some bird landing on the surface of water for example, or something in the sky smog or something.
As Neil Degrass Tyson calls it, these are brain failures
this documentary is a good introduction to this matter
https://www.youtube.com/watch?v=iWg0cWFQiiY