As he steps into the field, Vayne notices the grey haired man standing silently in the field, without a moments doubt Vayne places a genjutsu on the man. Inside the genjutsu the man sees several mirrors appear on the field the mirrors appear beside him, behind Vayne, on the ground(beneath us both), suspended in the air, basically every part of the field, the mirrors would appear in several various angles, the angles that they appear in reflect Vayne and the man himself, so basically an image of Ezio appears on several mirrors, and a image of Vayne appears on several mirrors. Now as he is trapped in the illusion the grey-haired man would see every movement on the field reflected on the numerous mirros, this does not only serve as a distraction, but it also serves as a means to immensely confuse the man. It also assists in a later tactic... Also a dormant(layered) second Genjutsu is also placed on Ezio, the Genjutsu would take affect after Ezio releases himself from the initial one, in the second Genjutsu the same effect of the first occurs, hence Ezio would be more inclined to believe that he wasn't in a Genjutsu in the first place.
The moment his opponent is trapped in the illusion Vayne materializes water beneath him -while moving towards the left-, the water materialized will gush upwards and capture the grey haired man, the water will form into the shape of a sphere, the speed of water's formation rate is rather fast, so this increases in it's efficiency in capturing the man. Inside the sphere the grey head's movements are restricted, and the water having surrounded him will cause him to slowly loose his breath, and eventually the man would need to breath, this natural act would cause the man to choke on the water surrounding him.
As he continues with his dash towards the left, Vayne begins to turn the dash into an arc, so he will remain within mid range of his opponent, however this action added with the genjutsu causes Ezio to see Vayne dashing all over the place, this will cause much confusion to Ezio, however Vayne didn't stop at that, he created a tiger made of ice, the tiger would dash towards Ezio. Anyway as the tiger reaches Ezio it will attack him, and if Ezio is still within the sphere of water the water would be frozen(of course the tiger would remain still so that he doesn't break the ice), thus Ezio would be frozen, however if the sphere of water was countered the tiger would simply strike down Ezio and pulverize him.
Copy paste FTW xD and using left "O" in sig