And that's the million dollar question. Tatsuo has a small piece of the answer though, at least, he thinks he does. For a moment, he looks down at his glass, wondering if he should order a third. He holds off for now.

"I think it was the little girl, Nishida's daughter. Everything that happened to her just... got to him. The fact Takigawa tried to kill a little girl and took her family away from her."