all things equal. gun in hand vs knife in hand.
That's a whole 'nother kettle of fish, isn't it?
Teuller's drill though, as I recall, posits gun guy standing there with holstered sidearm. Seven yards away, knife guy already has knife in hand. Knifer charges gun guy -- and here's where the demo gets fishy, because guess what happens when gun guy just stands there? -- you betcha, he gets turned into sushi. When the gun guy moves, though, his chances increase. If gun guy already has a bead on knifer, though, the matter turns into CNS hits and/or movement of gun guy. Otherwise gun guy still gets cut. Assuming, of course that knifer is really, really intent. This is largely the point of the drill. Develop some awareness of how close is too close, and then learn what to do about it.
And I disagree that the gunman can't go back fast, if he's been at all trained.
I don't quite disagree, but I expect most folks run faster forward than backwards, and see better, too, things that they might otherwise trip over. Question seems to be one of creating sufficient space to take further effective action, whether to King Arthur it -- "Run away!" -- or bust caps. (Which is the other part of the drill: Learn effective strategies.)
Trained knife guy will lose against equally trained gunman.
This one sure looks like a matter of distance, though, isn't it? And whether or not weapons are already in hand. (But isn't untrained gunman vs. untrained knifer more interesting?)
If you assume that its mr famous knife man vs joe blow gunman, that isn't a fair test situation.
Jerry Miculek vs. me? I die. Then I die some more after his lickety-split reload. (No doubt the exact same fate, too, versus anyone else.)
Mr. Famous Knife Man vs. Joe Dirt gunman? Not fair at certain distances. But fictionwise, we get to make up whatever we think works for the story.
For instance,
Kill Bill and lots of other movies tell us that swords are apparently quite easy to hide under things like yellow track suits, and that they (or knives in general) are always far deadlier than any kind of gun at any kind of distance.
Oh, and if you drop your blade, you can always use the Force to pop it back into your hand.