He hadn't done it to be kind hearted, but he had rather done so on a whim. To him, breaking the illusion array of the God Stele was child's play. In fact, a part of the reason he was being so hard on Nazaire to begin with was because he was ashamed of him for not being able to deal with such a thing on his own.
To Dyon, the only people his disciples were allowed to lose to were himself and his daughter. No one else.
Being stalled by a damned metal stele was unforgivable. If word got out, people would think that his teaching ability was lacking. That was unacceptable.
If others knew Dyon's thoughts, their pity for Nazaire would only grow.
The God Stele was a treasure of the ancient era. Others knew it as one of the treasures closest to the Treasures of the 33 Heavens. But this was only part of the story.