Let's think about it for a second. Byleth can, with Sothis' help, return to a previous point in time to undo a previous mistake, even going back to his own turn and stop an enemy from say killing Claude, though it has limited uses that can only be increased via the Saint statues.
Meanwhile, Gold Experience Requiem, from Part 5 of Jojo's Bizarre Adventure, has a remarkably similar ability. GER can basically reset an enemy's action and willpower "Back to Zero". So if you wanted to punch Giorno in the face, GER will say "No, I don't think you will" and rewind time to before you threw your punch, almost like what our little green haired loli dragon does for Byleth. The difference here is that GER can do this as many times as it wants, but for GER to activate this ability, it seems Giorno must be the one being attacked, though I don't believe that's eiver fully elaborated on.
So you know what means guys?
Byleth was a fucking stand user all along. Dorothea's hat wasn't just a weird little nod, she has Joestar blood in her.
Therefore, with the square root of the circumference, we can conclude Fire Emblem Three Hosues is just a medieval Jojo reference.
On a semi-related note, who do you think comes out on top? Byleth with Sothis or one golden Italiano boi?