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Regardless if you could the field attempted to block it or not, the aura could still quickly eat away at the outside layers protecting Yusuke's innards, and removing it by simply pushing it out with your own aura wasn't going to work so well. You were giving the energy more to work with. In fact, more energy to change and to corrupt. The very motion of the added demonic energy would increase natural chaos within Yusuke's body, allowing his own aura to grasp it and utilize it against Yusuke if it came too near.

Aura temporarily retracted to tightly around Cziri's own skin. The simple burst of chaotic chi soon faded away.
He waited to react or to not react.

Cziri was not afraid, however, he was done testing Yusuke. He appeared to be receiving near the full potential of his opponent, and to thank his opponent for doing so, he would begin the "final exams", so to speak. He also felt a strange sense of nostalgia as he saved Yusuke's data within his memory banks, noticing that the so-called hero had extremely similar hair.
"Hmph, nice hair. You look like me. Must mean you're trying."

And with that, he would do something quite unique to expand his influence. Altering the very packets of quintessence coding within the blades of long grass of this field, he would commandeer just about every aspect of their rather simple lives. Utilizing his massive influence, he would cause them to manufacture his own "chaotic-blended chi" as well as his natural "chaos aura." In conjunction with this action, they would also create their own chi that was free of Cziri's signature, except for the very innards of the grasses so called "spirit", and they would mix well within the chaos, creating a very powerful force that grasped the physical world causing intense waves of electromagnetic force and radiation, heat, as well as pressure to quickly flow towards Yusuke, that threaten to boil his physical form alive.

However, Cziri loves to coordinate assaults on his opponent. Forging his own essence into a strange form, he would create a strange blade held within his left hand that mimicked all the wavelengths and frequencies of the tiniest waves within Yusuke's body (at least the specific location it will strike), except with the troughs and peaks reversed. He would slash this blade upward, through the side of his incoming knee, all the way upward until through Yusuke's chest. However, these waves also targeted the supernatural wavelengths of Yusuke. This very blade displayed one of the virtues of Cziri; "disorder within order."

Keeping watch on Yusuke with his binary eye, he would log all the information, and adapt the blade accordingly.

To the second attack, how about no. Yusuke would have reached far too low, and no "demonic" speed can change that his hand would have to quickly extend and lower to grab an object that was already in a quick motion. And if somehow Yusuke could get there fast enough to block an attack with a weightless weapon, Yusuke seemed to forget that a quick raising of Cziri's arm and quick motion of the wrist to the left could easily slit Yusuke's wrist and disable that arm, and then easily slash through the arm and horizontally slash with literally zero resistance.

Cziri's free right hand simply would grab the wrist as his own chaos aura would only delay the silly demonic chi for a while, as the blade is lethal.

Interesting. Apparently Yususke can put his arm down to his knee, in fact, under his kneebone and even further to the left, while firing a right hook and already sending the left side of his body backwards for a right hook that was fired simultaneously with the "grab." However, that is foolish, as he didn't grab the hand and then pull backwards while his right hook fired. He probably wouldn't even touch Cziri's hand with his entire body with a lack of balance, complimented by the fact that the excited gusts were ******** with his position.

And no, there was no block. He simply intercepted your obvious counter-attack. I mean, Yusuke was bending a good portion of his body downward while he was flying. I mean, come on. Two, don't assume your speed is quicker than Cziri's. He can block just as you have blocked just about every attack.

And because of that, Yusuke should be in two pieces now.

Are such wavelengths so easy to hide? Not so much. Cziri intended for interference, in fact, he was using the very law of destructive interference to target any wavelengths of Yusuke that were in the path of his blade. Simple atoms hold tiny wavelengths that are not normally noticeable from a macroscopic point of view.

Now, your power might be very great, but a half-demon is by no means ridiculously over an avatar of a deity. Sure, I'm all for balance in a fight, that's why I make Cziri much less powerful than he would normally be, but I do not appreciate some sort of ridiculous unbalance in a fight. Just as you could focus your aura around your body as Cziri is; Cziri could "extend his aura" by using his eyes as a medium and manipulating his specific chakra meridians. It was not the blade reading the data, it was the eye logging the data and calculating changes in position by utilizing certain equations. His eye was aided by the chakra as stated, and so the blade was given energy ready to fit whatever form necessary (in this case, reversed wavelengths.) His eye read data at perhaps the most basic level, and communicated with the blade like so. Most supernatural energies do act like waves and so do many natural energies, transferring energy in a semi-ordered pattern. They usually do repeat certain sequences over time as they move, and unless you do truly have a different, logical way of using such energy, it is still able to be affected. If any thing, you could compare this to a strange conflict of energies similar to how you could explain "matter and antimatter;" they both would destroy each other on contact. Sure, this could become a war of attrition to survive, but Yusuke was too foolish to even act in that manner. His power is unevenly spread out, while Cziri is focusing enough for the eye, and devoting the rest to the blade as necessary.

And a note, this slash wasn't slow at all.

But in this war of attrition, Cziri had been saving energy, taking simple hits; also, he fed off the sun giving him even more potential energy and he had also stolen energy from the simple fields of life surrounding them.

How would the energy travel then? The only physical energy that doesn't truly travel in waves would be heat, and that would not be a fun example for Yusuke's energy. Waves and heat do travel through mediums, but heat follows the law of entropy and disperses. Even if Yusuke's chi didn't followed that law, traveling directly through the air or "planar space" would be ineffective. Regardless, Cziri could still counter.

No, Cziri extended his aura; even if you blocked him, he could still FEEL your aura and your information. He had it active for a while, and if the bit about wavelengths wasn't true, than why would he create something that he knew was impossible to create (in this case, destructive interference.) He would have noticed there were no waves and simply transformed his energy into the soul reaver form; a form that simply consumes others and partially destructs them using negative energy. Roughly, it would be the same war of attrition, except Cziri could downpower his eye.