Cain frowned when he became the center of attention for those soldiers. That was the last thing he wanted, as he had already decided not to take a leadership position during the ensuing battles since his bloodline's emotional instability could kick in at any moment.
In all fairness, someone like Cain, who could use Ego Wave, was a great leader, as that power could allow him to see everything from an objective point of view and think much faster. However, extended use generated a backlash, which he could not tolerate in battles that could stretch for hours.
Cain remained silent, but not before glancing at the cadets that turned to him, allowing a flash of his red light to appear in his eyes, scaring them. Those young people were too naive and lacked situational awareness, something he could not tolerate on the battlefield.