The reason I said you're using rapier techniques is that the left hand in front of the chest is part of rapier manuals but doesn't appear much earler, and you were doing a lot of thrusts. Dark Ages swords weren't meant for thrusting... look at Oakeshott's X - XII or so. The tips are often nearly rounded.
I'm more familiar with XI - XIII century combat, and by all information available they used very different stances and poses. The vast majority of cuts were in the vertical plane, for instance.
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