If true that the perp is a member of a yakuza crime syndicate - he will never make to court.
For this public outrage - against innocent civilians, and drawing unwanted attention to the “syndicate” — this guy is already dead...... assuming the yakuza hasn’t gone soft in the past 30 years.
won’t the loss of a couple of fingers suffice?
A man who is good with a knife can do an incedible amount of damage quickly and quietly. This man is a good example of that.