Makoto was genuinely surprised that, of all people, the Mizukage sought to interrupt the training session with his assigned Genin.
"I still have a couple days," Makoto stated, lowering his blood sword before the weapon became a deep maroon colored liquid that ran up to his arm and running into a small slit at his wrists, "But," He'd start, looking at Chigetsu in the eyes with an unusual intensity, "I am ensuring that they are ready. If they are not able to survive in these conditions, then I would not allow them to go into the exams at all," Because, of course, it was Makoto's right as instructor of these children to ensure that they were mentally and physically prepared for the Chuunin Exams. Just because Chigetsu was excited and wanted the children to participate did not mean that they were ready to participate. When Makoto was designated the Sensei over these children was the moment that he, not Chigetsu, was given the right to say when they were ready for the exams. Had they failed this final test Makoto could have denied their entry stating that they were not ready for the exams at all. He had to be sure that they would be able to survive. Chigetsu could have told Makoto anything he wanted too prior to this training session, however it wouldn't have changed what Makoto decided to do. Out of his three students there was one in particular that he had to ensure was ready for the difficult and dangerous exams where even the slightest rule could result in an untimely demise. Due to that one factor, Makoto had to push them.
"We are not leaving today, in any case," Makoto would explain, not that he really needed too. The exams were not starting for a few days out and, unlike Chigetsu, Makoto and his team were not expected to be in the land of Ash today. It was fortunate for them, but unfortunate for the Mizukage that the only one that was actually wasting time here was himself. Makoto was already aware about the time he needed to be there and he had that in mind in correlation with this test, the demands it held on these young teens, and the recovery time that they would need after this test.
"You three are dismissed," Makoto would say, crossing his arms. "You have the rest of the day to yourselves. Rest up, recover, pack. Don't forget everything you've learned today and let your wounds remind you of what is to come," Makoto would sternly say. He'd focus on Chigetsu a moment, thinking about this interesting scenario. Makoto would look to the right and left a moment, before returning his attention to Chigetsu, "Hotaka isn't going to the Land of Ash with you?" It wouldn't be that surprising if Chigetsu had Hotaka go in his stead while he reprimanded Makoto, which seemed like what was about to happen. If anything, Makoto was a rough, diligent, harsh, body-breaking-mind-rending Sensei and it wouldn't be all that surprising if his methods were to be questioned here and now. Makoto wasn't arrogant enough to believe he was beyond being corrected, but, most of the time, that didn't change how he chose to train those under him. Such a remark especially wouldn't have caused him to withdraw such an important test as the demonstration of being able to survive all on their own while being hunted by the enemy. This was his Genin's trial to standalone, without their Sensei to guide them, and to work together while in the worst of conditions. The fact that they were able to endure this meant that they would be able to survive the Chuunin exams. They had passed their final test as Genin, at least by Makoto's standards, and if they would pass the Chuunin exams they would be, in Makoto's opinion, ready to be leaders and independent units.
Now that the test was over they just needed to recuperate. Likely food and sleep would take up most of their time, but they'd know better, having just passed their most difficult training exercise with Makoto, that there was plenty they were unprepared for and that, for the upcoming exams, there were precautions they needed to stock up on and mentally devise. There was plenty they learned and experienced going up against Makoto and they'd have to take that knowledge and turn it into the needed wisdom to survive for their unknown futures. Makoto would get them on time to the exams, so if the Mizukage was worried about that it was something he didn’t need to worry himself over.