Hort,You're not wasting your time....

Hort,

You're not wasting your time.

Clearly organized motion in the sequence.

Problem with the clumping discussion is that it moves down and then to the right, not just down.

Lighting changes, quite visible in the sequence, seem unrelated, visible on he "white bar" shadowing below.

Yep, I know what you're thinking.

Any related frames around this sequence other than what you set up as a gif.

In particular, can you point me to the original last two frames?