Ken was sitting down by a river with his sword by his side and his father's Kama in front of him. Ken was simply staring at the weapon he used to slay the man that helped bring him into this world. Why did he feel so terrible about it? The man sold him into a life of slavery not even a month after his mother had passed from a terrible illness.
He was tortured mentally and physically. He was humiliated and he was abused. But none of this came close to the panic attacks he had when he finally accepted what had happened as a fact. He was with her when she passed after all.
Ken thought about throwing the weapon into a river but he knew that, that was not the way to solve his problem. He knew that he needed closure but how could he get that with his father being buried six feet under?