If he knew that his opponent was a high-level wizard, Silver Eye, as a mid-level mage, would definitely not try to capture him.
Furthermore, due to the nature of their profession and external pressures, high-level wizards are even rarer than Silver Knights.
"Darran School? Interesting!"
Su Lu smiled, "Your manipulation of metals, particularly your concept of mercury, is fascinating."
As an semi-spellcaster, he could understand magical notes.
Moreover, he had also gained some understanding of this world's 'wizards'.
They were actually a generic term for spellcasting professions.
For example, Silver Eye, if he were in the Main World, might have taken office as a [Metal Mage]. In addition to this, there are [Element Mages], [Illusion Mages], and so on. However, in this world, the mysterious aspects hadn't developed to such a vast and detailed scale, and all supernatural powers that were non-knight were attributed to 'wizards'.