Thank you Kaladin as well as Bludfyr.
Very interesting as previously said, yet also still very mysterious. It's pretty obviously a horse dragging the coffin around, and the imagery makes it clear the coffin bearing the Band of the Falcon's crest contains Casca's broken ego, or at least a portion of it. Very curious what the ghostly robed figures are/represent as well. Is it the rags on poles that morph into these? Man, that suspense... Also very intrigued by that child-like figure. It's not the boy, it's yet another representation of Casca, and I think it's one that's hiding itself. It's "the thing in the Abyss of Casca", as the text says.