OOC: Already realized, sensei
Taking note of his master's chakra signature, Kirito smiled, snidely replying in an instant, just as the man vanished into the sand dune.
"Understood. I'll show you I've earned the eyes I hold so dearly."
Quickly looking around, Kirito could deduce two things nearly instantaneously. For starters, this desert had appeared out of literally nowhere, so he didn't even need the sharingan to figure out exactly which genjutsu he was under. Kirito happened to know the same one as well, hence the ability to figure out the specific technique. It was the Demonic False Surroundings technique, one which masked the true environment of an area. You could make a man think he was in the middle of the arctic if you wanted. However, it didn't change any of the real physical elements of the area. This meant temperature, noises, and weather conditions that you could specifically feel (like sunlight) may appear to be real, but would not be felt outside of the real environment's conditions. In short, in only affected one's sight of an area.
Blinking once, his eyes simply pierced the illusion basic visual illusion, the false surroundings swirling towards the outside of his vision, and then disappearing entirely, revealing the dark clearing in which he had begun this training. Surrounding him were paper bombs, obviously placed in a way that they would stunt his movement towards his master, even if he could see him with the sharingan during the illusion.
Once again looking around, he could see things in an almost heat vision like manner. The trees, the air, all of it was almost being put through a filter for Kirito's eyes. However, a single visual object stood out among the mundane environment. The vibrant red and orange silhouette of a man. Walking slowly towards the blatant chakra signature while avoiding the paper bombs, Kirito chambered his right arm, and thrust it forwards in a light punch to the man's nose, hitting him square in the face.
"Sorry bout' that. Buttttt, guess I found you!"