During his time in The Land of Iron he witnessed a weapon master samurai who was welled versed in literally all weaponry as his name suggested. He was testing out a Halberd with a flag on the end and he began to spin it quite violently between both hands enough for small amounts of air to be heard whipping. So this is where the idea came to him.
Using a sword, or two depending on preference using their wrists or fingers the user could begin to roll their wrists or balance it from finger to finger. This would lead into a vicious spinning cycle which would whip the blade around so fast air could be seen moving away from it and the blade would nearly be untraceable by the untrained eye. It could easily block most projectiles and strikes from weapons enough force to knock someone back who would attempt to clash. Also depending on the jutsu it could also be dispelled via this technique.
Option to use chakra control to augment its power
Easily blocks or re-directs projectiles
Dis-arm or unbalance someone who tries to clash against it
Has to stand completely still
Needs a speed build up depending on speed stat (half a post to a post windup)