Green Light in Praetorium?

[Alleluia]

Now that I've had to run Prae a billion times over the last few days, I couldn't help but notice that green light ball in the Ultima cutscenes again. Have we ever managed to figure out what that is? Seems important.

Pics for reference:

EDIT:

Vid referenced in later post: https://youtu.be/wYVN_WpSTu0?t=707

^ It comes into frame at 11:52. And again at 12:14.