The atmosphere fell silent as the students and teachers heard the sound of slaps and blatant threats from Setsuka. They didn't expect that the student council president would act so decisively toward the first-year students. They didn't know why Setsuka was angry, but they were sure she wouldn't slap the male student for no reason.
On the other hand, Noboru and Takaya opened their mouths wide. Neither of them thought that Setsuka would directly slap the male student before they even had the chance to do anything. Besides, her threats sounded a bit cruel to a first-year student. They didn't know what made Setsuka overreact like that.
Unlike those two, Akina could sense that there was something between Setsuka and Tenku. Setsuka wouldn't be so angry with the male student if Tenku had only saved her life. She simply gave words to warn that boy instead of slaps and threats.