Hm, didn't really detail this, but:
The strap system I was referring to allows the scabbard to be pulled down while the blade is drawn upward, providing the arm to have enough reach as the unsheathing is in two directions instead of one. Basically, as you draw the sword with the right hand, the left hand pulls the scabbard.
Once the left hand lets go, however, the straps are designed to pull the scabbard back upward to the original position, acting on kind of a "springy" mechanism.
In any case, if the Welshmen assassins were better than soldiers with back-drawn swords in those days, I guess there would have been little need for any strap mechanism mentioned above. Thanks

