Chaosmancer
Legend
Cool. This doesnt actually answer ny question, but lets go with it. Swords can cut that or something.
Seriously. It's all BS. You just have to apply enough of it wherever needed to get the mechanical effect desired.
Easy enough to explain why swords cut it. Again, this is something that has been done in literature a thousand times.
Swords are swung with intent, the intent to cut, the intent to kill, the intent to protect. What is cutting a psychorecpetive force isn't the physical sword, but the intent of the sword cut.
There you go, easily explained and fits in with the technobabble