They talked about how Athena put her essence in the Heart of Sabik, hidden from Lahabrea's view, and waited until recently to activate it. Does that mean that I can safely headcanon that the green/blue glowing orb here, that has been left in the cutscene regardless of several reworks of how this dungeon/encounter works, is Athena's essence being released/leaving the Heart after it was used to cast Ultima? Cus I think I can now and I'm a bit relieved, to be honest. lol