Ooh... I mean, maybe, it can be revised with respect to the four human figures and to that diagram of the Rosettes at a whole.
For example, if the left bottom rosette implies the South and Abyss (as I suspect), it may mean something connected to it. As I wrote in my blogpost, I think that the Rosettes scheme has some relations to legends about the Stone of Foundation (The Cornerstone) which was casted into the Abyss. Therefore I can suppose that one of the four human half-figures who keeps some ball-shaped thing can represent the throwing of that stone.
For example, if the left bottom rosette implies the South and Abyss (as I suspect), it may mean something connected to it. As I wrote in my blogpost, I think that the Rosettes scheme has some relations to legends about the Stone of Foundation (The Cornerstone) which was casted into the Abyss. Therefore I can suppose that one of the four human half-figures who keeps some ball-shaped thing can represent the throwing of that stone.