On stabbing versus slashing, I think you have to look at your situation. If your opponent also has a knife, I think FMA calls for disarming your opponent which would mean you slashing at their knife hand largo mano style until they drop their weapon. Typical pocket carry knives are going to be 4 inches or less, which means even if you do intend to kill your opponent, chances are it will take a long time to find an organ.
What if the Hokey Pokey really is what it's all about!?!?