Though he may be infuriating at times, Sion is an ally, a classmate, and most importantly...a friend. She needs to warn him; if she can't save him personally--which, let's face it, is unlikely given her limited faculties--then he can at least save himself.
When Esmeralda complains about a marriage proposal from a Sunkland noble, Mia inserts herself and her friends into the entourage, and they make for Sunkland.
Will Mia be able to avert Sion's death, or will the future refuse to budge?