The only guy I ever knew who was good at knife fighting was a close friend of mine when I was stationed in Europe. He studied Escrima his whole life, and was very, very good with a blade.
He told me there is only one rule in a knife fight – if you get in a knife fight, you will get cut. Best resign yourself to that right now.
The wicked flee when none pursueth..." - Proverbs 28:1