"You-- You! You people daring to talk about righteousness when you have very clearly killed my son. Such merciless individuals such as yourselves should just rot and die! Oh, benevolent lady of the Greenwing City Hall, please uphold justice for my son for he was murdered by these criminals. This humble elder of the Torquiosetail guild is seeking your help." The father cried for mercy toward the lady who is hosting the auction. He is quite witty since he knows that the lady is preventing him from taking action against the five due to her preserving the peace of the auction.
Even though he is a mighty individual that went past the 20th floor of the tower, he is still helpless against the rules of the city. Once he is suppressed, he cannot possibly deal with the lady, much more the murderers of his child. He decided to swallow all of his anger and guilt the lady to the max in order to make her suppress or even kill the group.