I have the old AEMMA manual on longsword, which was released back in like 02 or 03, and I have been working from it a little bit (because right now I don't have any translated fechtbuch, or any of John Clements' books). What is really confusing me is how they expect me to block a fendente [vertical] or squalembrato [vertical oblique], they want you to step to the outside with your rear foot, crossing your lead. For example (from p 103, 6/26/01 edition, "Art of Longsword Combat - Book 1", AEMMA):
.....
2. The agent steps forward with the right foot, and delivers a downard vertical strike.
3. At the same moment, the patient agent steps to the left and forward with the trailing right foot (traverse left), and delivers a guard of the window left - the end result is the patient agent's sword point is oriented towards the agent.
Pay special attention to the bolded passage. The obvious result of this, to anyone that takes a second to think or do it, is that your rear leg becomes crossed over your lead - putting you into a very vulnerable spot. This also goes against the form for the Guard of the Window; the legs are obviously not crossed in this form. And if the idea is to begin the traverse with your rear foot, surpass your lead foot, and have your lead foot then become the rear foot, it all seems very convoluted and needlessly complex. Not to mention how dangerous this is; my first instinct, to someone who did this in regard to a downard strike, would be to pull the strike and deliver a zenpo geri (stomp kick) across to their waist, driving them down over their crossed legs. There wouldn't be much they could do to stop from falling over, either. Another way to destroy this would be to re-direct the strike, bind their sword on the hilt, and force them back over their legs and down to the ground.
It would seem to me, that the proper movement for this traverse would be to begin with your lead foot; the lead foot moves out straight to the left, pulling your body off line; then the rear foot follows, orients itself towards the attacker, and becomes the lead foot. The original lead [now rear] foot is already in the proper orientation because of the step.
I assumed this was a typo, so I went digging through the pictures of long sword training at ARMA to find what I thought looked right; but I found this which makes me wonder if they really did mean to cross your legs.
I'm confused here. It seems like this is a really good way to get hurt. What am I missing?

