During the final event of the Grand Magic Games, Gray is tasked with beating Rufus, which is the key to Sabertooth's fall. But it seems to be a one-sided battle as Rufus uses his Memory Magic to make new magic, as well as causing Gray to forget his own!
But this is a "new interpretation." 
The memories I have of your Ice Molding Magic
لكن هذا "تأويلٌ جديد". لقد تحقّق هذا الحُلم الباهر
!بفضل ذكريات سحر تشكيل الجليد الخاص بك التي أملكها