Hi JammedStab,
Has anybody ever seen or had the F/A report something like this?
Yes, it is not all that unusual for people to "see" a ball of fire move.
Apparently it is caused by the eye retina receiving a very bright pulse of light (e.g. during a lightning flash.) Some of the light cones in your retina get over stimulated and when you look at something much darker, you think you can see a round red ball which appears to move as your eye scans across the dark background.
Try looking at the sun momentarily, then close your eyes. You'll "see" a round black ball.
This explains why we can see some colours better:
https://www.youtube.com/watch?v=GbHMLV4CZfI