Experience and a lack thereof
I know of very effective fighting stances (seigan and chudan no kamai) that extend the knife at least partially, especially as your opponent lunges in.
Hi John,
Thanks for the welcome!
Just to clarify, my comments/advice were offered for
(1) someone who is a novice to the idea
vs.
(2) someone trained in a entire 'system'.
Also, as far as kenjutsu/kendo techniques go, I'll say that most of them are not readily transferable to knife techniques especially of the size/style of knives 'most of us' are likely to have available (either by carry or emergency purchase). Seigan no Kamae/Chudan no Kamae as a sword fighting posture falls within mid to long range fighting vs. the short range knife on knife (or even knife against empty hand or other weapons). In fact, the ready guard of Chudan no Kamae with a sword is basically the same as with a spear or halberd (yari/naginata). I know a lot of katana techniques translate into identical or near identical wakizashi/tanto techniques but even the typical tanto is probably larger than the blade 'one of us' would likely be carrying in our society and again, its usage would be tied to a combat system.
Another major concern is that as a technique of the long sword, spear or halberd, Chudan no Kamae is pretty much intended for a two handed grip since the tsuba and even the blade offer some protection from the opponent's blade. With the two handed grip, an attack from the opponent can be fended off by blocking (actually, deflecting) with the blade. For that matter, European rapier, saber and foil/epee sword fighting also use a ready guard with a blade in front of the fighter albeit with one-handed grips. Even though they're one-handed swords, the blades and guards of the European saber, rapier and fencing sword also offer protection to the carry hand. That's not the case with the style/size of knife we're likely to carry or acquire as an expedient weapon in our society which is likely to leave the carry hand pretty much bare as far as protection from an opponent's blade or blunt weapon. For that matter, I've seen more than one knife that was presented too far forward actually being grabbed by the blade with close to half of those resulting in a disarming of the knife-wielder or at least momentary incapacitation that allowed him to be cut. (In fact, pretty much what happened in the duel near the end of the movie Rob Roy as was discussed) Obviously grabbing a knife by the blade will probably result in a nasty gash if the knife is sharp and sturdy but most guys aren't carrying a Bill Bagwell hammer forged bowie.
My advice about keeping the blade close to the body addresses a few concerns:
(1) keeping the blade hand out of the danger zone (cutting range of the opponent) until the last possible moment,
(2) keeping the blade 'invisible' as long as possible,
and
(3) allowing more flexibility for the type of strike since the close guard position allows a stab or a slash with no change from the starting point; this also goes along with a reduction in 'telegraphing' the kind of strike that's coming.
In this respect, the 'style' is closer to Escrima/Arnis as well as that seen in the 'American Penal System', the latter of course being motivated by a desire for concealment in the pre-attack phase to surprise when the attack begins.
All interesting stuff!