Vadi Chapter 15
From Chapter 15:
"Grasp this, that is a steelyard’s trace,
That is the companion is in the iron door guard,
You should be in the archer’s guard,
Watch out that your point does not waver,
That of the companion covers his sword;
Go a little out of the way
Straightening the sword and the hand with the point.
When your sword is joined at the crossing,
Then do the thirteenth constrained action,
As is you can plainly see
Pictured in our book of seven leaves."
Note that this video goes to the 11th not the 13th play. Correction to follow!