Those questioning Donari's combat prowess immediately shut up. There was simply nothing to be said, even his own elder brother had a solemn expression on his face. He had thought that he had been rid of this annoying younger brother of his after he stormed away from the family, only to realize that he had become even more of a problem.
As for Dyon, his eyes shone as he looked at Donari's use of his constitution.
Although Dyon hadn't studied constitutions as deeply as Clara because he was waiting for his wills to unlike before choosing his own, for obvious reasons, that didn't mean he was completely ignorant about them. He had the base knowledge necessary to, at the very least, recognize them.
Donari's 'A Killer's Symphony' was very easy to spot, but understanding how it was used was a completely different matter.
Before hand, Dyon had thought A Killer's Symphony allowed a person to condense their soul energy into an attack, however, this was very clearly not the sake.