Kosuke scribbled something on the his clipboard, and then tilted his head to the side when he saw Neji trying to set up a trap. He had been sitting at his desk the entire time. And is there some reason he needed to do that? Well, that doesn't matter Kosuke needed to get this exam over with. His wife would beat him if he came home late... again.
"Okay, next technique," he said as he took out a kunai, "Substitution!"
When Neji was ready, he flicked the kunai at his direction with little strength.