If you have had (good) formal instruction on longsword cutting mechanics, you would have been informed that you don’t want to create a levering action between your two hands. Here’s why.
There are two different ways that things move: translationally and rotationally. If the big words scare you, think ‘straight’ and ‘spinny’.
Does “It only takes 4 ounces of pressure for a sword thrust to pierce the body” make sense to you? Because from a physics standpoint it’s nonsense!
Learn a little more about some of the physical properties of swords, and why you are probably using terms like ‘Center of Percussion’ incorrectly.