A new Avengers: Endgame theory suggests that Captain America’s dance with Peggy Carter took place in the Soul World, after he returned the Soul Stone in exchange as part of his off-screen mission at the end of the film. A fan posted the theory on Reddit and wrote, “Cap’s off screen mission at the end of Endgame was to return all the stones to their original timelines exactly at the point they were removed. Most are pretty simple like just give the time stone back to the Ancient One, put the power stone back on Morag et cetera but returning the soul stone to Vormir does not seem to be so simple. ‘A soul for a soul’ are the words the Red Skull uses when others take the stone, so by that logic, to return the stone surely ‘a soul for a soul’ would still apply.”
