Secondly, weapon damage is very hard to achieve. Notice the sword swing in the beginning. No doubt that a strong bludgeoning blow would still deliver concussion damage, but a sword by itself, specially a light sword has no place in this combat.
Finally the most effective tactics are hand to hand close quarter combat. Grapple, pull, push and bringing down the armored knight is a good strategy. Pinning him down on the floor for a good knife attack is clearly a winning strategy.
So it's time to go back to the drawing board and put more attention into those hand to hand combat rules.