I heard this from Sylphy after coming home. In the past few years, Eris has been single-mindedly training at the Holy Land of the Swords for the sole purpose of fighting Orsted by my side. The cause was the fight with Orsted at Red Dragon Lower Jaw. Seeing me practicing [Magic Disturb] afterwards, she mistakenly assumed that I intended to challenge Orsted. Although I never felt a tremendous difference in strength between us back then, Eris thought otherwise and decided to leave and train.