Lord Denzel was revered for several reasons.
One was, of course, due to his great power and skill as a Mage. He was one of the few who could cast Tier 9 Magic—the highest attainable by man.
However, that wasn't all there was to the old man.
He was well renowned as a scholar before gaining such heights in Magic. Unlike his very close acquaintance who was naturally gifted with godlike talent, Denzel had to utilize his intellect to make it to his current status.
Thus, he understood the importance of the environment—among other things—in a confrontation between two Mages.
If a Water Mage was going to confront a person, such a Mage had to choose a location with much moisture. If an Earth Mage desired battle, he would have to choose a well-grounded region.
Mages generally required locations that suited their capabilities and affinities. Then... what about Denzel? How did this apply in the current situation?