Sorry for the repost...
I don't think the knifer needs to know how to use a knife. It's all primal aggression, at that point.
Knives scare the @#% out of me tactically.
Rather face a pistol.
snip (WARNING: If there is a knife is sharp at all, you are going to bleed.)end snip .
"The right to carry a bowie-knife for lawful defense is secured, and must be admitted. It is an exceeding destructive weapon. It is difficult to defend against it, by any degree of bravery, or any amount of skill. The gun or pistol may miss its aim, and when discharged, its dangerous character is lost, or diminished at least. The sword may be parried. With thse weapons men fight for the sake of the combat, to satisfy the laws of honor, not necessarily with the intention to kill, or with a certainty of killing, when the intention exists. The bowie-knife differs from these in its device and design; it is the instrument of almost certain death. He who carries such a weapon, for lawful defense, as he may, makes himself more dangerous to the rights of others, considering the frailties of human nature, than if he carried a less dangerous weapon." Cockrum v. State, 24 Tex. 394 (1859)