Kat Martin has captured something weird flying above Yellowstone. I have seen this type of thing before, but never changing direction so fast as this did.
There are lots of lights which are just reflections. The one this video is about is the bright object which comes in from the upper right of screen. It does turns and then settles near three line where it flashes very bright and appears in different places. It then flies off to the left, then makes a hard right turn.
This was live on the Yellowstone cam at Old faithful on May 5, 2019. Kat slowed the video down because whatever this was moved very fast.