The son, in order to save his own life, even betrayed his father, which truly chilled Kujo Mutsumi to the bone.
He was utterly disappointed in Kujo Hikari, and simply ignored him, spending two minutes to quickly recount the truth - including Kujo Hikari's feigned ignorance and the motives behind the mistaken murders of his wife and lover.
From the recount, Kujo Hikari picked up on a different implication, and was instantly engulfed in shock and anger, accusing his father of betraying his son, with hatred already showing on his face.
Even so, Kujo Mutsumi's mind was still clear. He neither swelled with the power he held nor allowed his son's influence to cloud his judgment... During the recount, he calmly analyzed the pros and cons.
Undoubtedly, Fushimi Roku held absolute power in this moment.
What is power?
Power is the ability to 'hurt others.'
