Ness heard Sunders' words.
And he was furious! Sunders knew about the nature of the gray fog all along!
Ness spent years of his strength on Angor so he could learn the data of a "new soul spell" from Angor's soul and recreate the spell using his expertise as a soul master.
But there was no such thing as a "new soul spell"! This was the embodiment of natural law!
And he could not possibly study the rhythm of a law! This was a gift bestowed to lucky people by the world's consciousness. Only legendary wizards had a chance to comprehend the force of the law by other means.
It was already a big question of whether Ness could become a level-2 wizard in his life. Legendary? Forget it.
And Ness was infuriated about how Sunders tricked him into doing the experiment.
Sunders was the owner of a gravity garden. He would see the law of gravity all day! Obviously, he could see it from the strange fog!