I agree with the comment made about running away; it's a good strategy if possible.
I've been involved in a few actual knife attacks, and witnessed a few dozen more.
I like simple, basic techniques. Paragraphs and pages about how to stand and walk are, to me, redundant and over complex.
Do what comes naturally. Probably the best way to stand and move resembles a boxer's stance. It's simple, mobile, and allows you to deliver power.
Intricate stepping patterns and techniques will do one thing very well....and that is, get you killed during a real-life knife attack!
I've never seen anyone perform complex stances, steps, or techniques during a knife fight or attack. This is not to say that I've seen it all or that my opinions are the final word. However, I have seen the real deal several times, and seen people killed with knives, and it has certainly influenced my views on real combat.
If someone ever attacks you with a knife (and I hope to God that never happens to any of us here), it's going to take every ounce of your being just to get through it, physically and mentally, without remembering stepping patters or intricacies.
I advocate using a few simple, powerful techniques in such situations. Keep It Simple, Stupid (KISS) is the way to go.
Sniper -- One Shot, One Kill Email: ST8PEN01@aol.com