Astin was feeling that something was going terribly wrong when he didn't feel any increase in his level when the golden and green light covered him. But he wasn't sure what was going wrong. He looked at the surroundings keenly just to find nothing wrong.
His plan was successful and all the other teachers and students from those three academies were restrained by using the precious artifact they got when they last entered this dungeon. But he still felt that something was very wrong with the situation and if he didn't take an appropriate step here then the future waiting for him would be terrible.
But he was not able to do anything. When the ritual started he became unable to leave the platform on which he was standing. He felt that he was improving little by little even if his levels didn't go up. This fact gave some peace to his disturbed mind but even then he was still feeling something wrong.