From the "I can kill him with just my spit" provocation, I thought that this would become a contest-type duel where one attacks and the other defends. "If you can defend against my attack 10 times you are the winner", and then spitting the ancient sword dragon breath.
Oh my god imagine if fy used myriad self with the sword dragon transformation and somehow made it so that It made his copies ancient sword dragons instead of just clones of his human self