As Kai's mind was working at full throttle to find an escape route, his father seemed to have been quite affected by his son's words.
His face had a visible frown on it and his mouth seemed to twitch ever-so-slightly as if he wanted to speak but couldn't. His ego had taken a hit from his son's words and it didn't feel nice at all.
He was a man with blind confidence in his abilities and yet those words affected him greatly. Especially the part about the fact that he killed his own wife with his hands. That was sadly the truth.
That was his one and only mistake that he believed was horrible from his side. Even to that day, he still regrets what he did to her. He was so completely clouded by his desire to conquer that he threw away the only person he loved in his life.