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!
Come to think of it, Dragon Slayers 
have a strong sense of smell, right?
بالتفكير في الأمر، لدى قاتلي التنانين حاسةٌ شمٍ قوية، أليس كذلك؟