This was not the first time Han Xiao had fought with a Mage. Every Beyond Grade A Mage had their own style and a different way of fighting.
Ravenlaude was one of the Ancient Ones. Although, due to his limited potential, he had already reached the top of his strength and would not be able to become a peak Beyond Grade A, in his long life, he had learned countless spells. The Arcane Institute under his command was an organization used to study and invent new spells for him. In this fight, he had showcased his extremely broad knowledge in the study of magic.
As an Ancient One as well, 'Dragon King' Milizaus' style had very clear differences. Milizaus focused on the powerful dragon magic spells, fighting with raw strength in a straight forward style, while Ravenlaude had endless spells to swiftly deal with all kinds of situations.