With his eyes, the Uchiha would see the chakra silhouette of his opponent forming a string of handseals he would be tracking, and once the technique specific hand seal is completed, it would be obvious to him what would happen. Seeing his windmill about to have contact with the Jikūkan Kekkai, he would poke his head out from the smoke. While not being able to stop it, Vale's mind would race with thoughts as he would quickly activate his Space-Time Technqiue.
By using the summoning seal upon his chest, it would resonate with the seal upon the bunshin, summoning the doppelganger to him within the smoke (which would promptly clear), it obviously taking some damage from the blast but not the full brunt. Vale's dimension would be mostly fine, save for a partially destroyed prism.With the blast only reaching ten feet, the damage was not extensive to the vast abyss. However, the original monkey would be blown to bits.
Due to the nature of the shadow clone, it would be able to reshape itself from the damage. Having completed the first step (his seal jutsu in the dimension), though with some trouble at the end, he and the original would know what next to do. As stated before the two would be in nearly perfect sync, mostly due to Vale's calculating nature of various plans beforehand. Not only would the bunshin be brought back, but the monkey clone as well, having stuck with the twin till the end. Giving the primate a quick glance the Earth-Vale would convey the next steps via Genjutsu in an instant.
(Would also note that the original never disappeared from the field, as he was referring to the clone and made the distinction)
All three would perform handseals behind their backs, immediately emanating a bright light from their bodies. This light would attempt to trap Kamui in a Genjutsu, this particular Genjutsu being Genjutsu: Double Optic Delusory. If successful, Kamui would find himself trapped in an illusion where his mind would think he is bound and gagged by painful spiked chains in a dimension composed from an innumerable amount of randomly arranged and differently sized rectangular prisms amongst a dark and seemingly endless void, Vale's "Kamui" dimension. With his mind thinking he is unable to move, the same effect would transpire in reality. However, this wouldn't be the end to it, far from it as Vale's plan would attempt to send Kamui into a seemingly endless nightmare.
Its possible, and highly likely, that Kamui would see through this ruse and dispel the Genjutsu. But it wouldn't be that simple as a second illusion would be under it. This time it would be the grassy plains, but with him neck deep in Doton: Yomi Numa, Swamp of the Underworld. This repeating process of a double illusion would continue twice more if he breaks out of the first set, binding him in each one with pain and the Vales (and monkey) gone. Why? Due to the fact the other two lights would hit his opponent, instantly, leaving no room to see the real world until each one is dispelled. This makes a total of 6 illusions to escape from,something that would be impossible for even the most skilled Genjutsu Master to do in less than 3 seconds.
A second however is all that is needed for Vale's attack as the clone would attempt to deliver a powerful and hopefully finishing blow. With knife his hand he would try to deliver two strikes, one with his knee and the other with his knife hand. Using his pride and joy, his speed and strength, the Uchiha aims to drive the knife into Kamui's good eye and his knee into his right side using a tremendous burst of speed that would get him there in a moment. With strength to demolish boulders without any Gate enhancements, his attacks would most likely break the bones in his opponent's neck, head, face, and ribs.
If not left blinded and bleeding by the knife, the force of his hand would be enough to crush the eye, breaking his skull and the C1-C6 of his neck, paralyzing him completely. His rib strike would most likely shatter his ribcage, leaving the shinobi a battered mess, unable to move, probably knocked unconscious from his body going into shock from the severe nerve damage.
By closing their eyes, they would make sure not to be trapped by each other's Genjutsu, using sensory skills and memory to locate Kamui perfectly, knowing exactly his position as Vale is accustomed to using them to compensate for blindness, able to follow Kamui if somehow is able to move.
Kuchiyose no Jutsu- Summoning Technique
Genjutsu: Sharingan- Illusion Technique: Copy Wheel Eye
Raiton: Raigen Raikōchū/Magen: Nijū Kokoni Arazu no Jutsu- Lightning Release: Lightning Illusion Flash of Lightning Pillar/Demonic Illusion: Double False Surroundings Technique