Cavorting with Chaos

Witches are what magical girls fight, and it's what hatches out of the soul gems when they lose control. Labyrinths are their domain. So she's probably either reliving memories of hers or well, she's entirely correct. That seed is basically the Witch's corpse after Khannie defeated her. So the inside of it is probably like a Labyrinth... Zebes is doing guesswork for a lot of this.