I assume the sword could turn into the shield, or it could be some sort of melding of minds, where the two egos become one individual entity.
Or it could just be some weird limb-like extension of its "body", who knows. They're all sword-ghosts, no need to overthink it.

Anyways, I had something typed up but forgot I hadn't actually saved it before I swapped the battery out of my laptop. Whoops. Shouldn't take too long to reconstruct, though I may need to leave for Houston today. That would delay everything until about ~1 AM.