Knife Fighter: The Omnibus Edition (Paperback) by Loren W Christensen

Knife Fighter senior to his son. "Facing a deadly threat with a knife is a moment like no other. Suddenly you're no longer pretending as you have been in your training. Shit is real now, and to come out of it alive, you're going to have to ram that blade deep into human flesh. And you're going to feel that sensation in your hand, and that feel is going to remain in your hand, and in your mind, and the sight of him dying is going to stay in your eyes, even when you're asleep."