How does Jeanne try to explain her father’s abuse of her mother? What is different about his abuse the night Kiyo rushes to their mother’s defense?

Jeanne tries to explain that her father spent much of his time drinking, that his experience had brought out the "samurai" in him. The night that Kiyo rushes to his mother's defense, however, Jeanne was "sure he was going to kill her or hurt her very badly."