The Wind Duplication is an envy-worthy Inheritance Ability of the Wind God Temple's main inheritance. It is the best ability to be used in War but it worked fine in dual too.
As I had said, the clones it had created are not completely realistic as what Elina did with her Art, one could clearly see them being wind clones but they are not as powerful as the clone Elina had created. These clones only have 10% power of the main body.
The reason this ability is envy-worthy because numbers one could create with it. The professor said, the most proficient one could create more than hundreds of wind closes that each had 10% of the main body, this is not Art of Elina could do.
In the War, they could become terror but here when in the duel they are not much use as I am only slightly weakened than him and his clones of 10% strength would just annoy me without dealing with much damage and that is what it is doing.