There are few methods for securing the legs, but often they are left free so that the prisoner can be led to where ever.
All the methods I have seen are tied seperately after the torso and arms are secured, this is so that they can be easily removed to move the prisoner.
There are a couple that have the prisoner lying down, and a few that have him seated, most that I have seen only really tie one leg, either leaving the other free, or relying on one leg to bind the other.
Acouple of simple ones.
If the free end of the cord is at the front of the prisoner make him sit cross-legged and simply tie the lower ankle after passing the rope inside the upper knee. This effetcively stops the other leg from being disentagled and keeps the prisoner in a sitting position.
If the free end of the rope is at the back, lie the prisoner on his face and place the left ankle behind the right knee, then bend the right leg back and tie the right ankle to the left thigh, if tied tightly enough this is both extremely uncomfortable and restrains both legs, otherwise just tie the one leg a little more loosely which prevents escape but does allow the prisoner to sleep.
Hope this helps.
Neil
Neil Hawkins
"The one thing that must be learnt but
cannot be taught is understanding"