He didn't say what he said in support of what Arthur did. As someone who supports the family above all else, he would be truly angry if Brian had acted against Arthur after being spared for his first offense.
Patriarch Calcetti glanced at Augustus from the corner of his eye and said, "Yeah. You should know about learning lessons after the first foolishness. I'm sure that you already have a plan to make your second son shine during his sect examination."
"I truly hope that you have a plan. You better have a plan so that I won't regret not beating you after your first foolishness."
Augustus coughed awkwardly and wanted to explain himself. He said, "Patriarch, I don't think it is possible for…"
Patriarch Calcetti glared at him and asked, "What is it that you don't think is possible?"
He wanted to say that he didn't think it was possible for Tyson to reach the first position in the examination. It is a reasonable thing to say.
