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!
I admit it, I underestimated you a bit. 
I didn't think you would hang on this long.
أنا أعترف، لقد استهنتُ بكَ قليلاً. لم أحسب أنّك ستصمد كل هذا الوقت