Seeing that his method had captured the attention of every apprentice officer, the officer smiled smugly and nodded.
"Are you all awake? Actually, I was almost asleep just now." The officer's voice was clear and piercing, yet much louder than when ordinary people spoke; everybody in the auditorium could hear him perfectly, which was obviously the effect of a spell to amplify sound.
Winters thought to himself that amplifying one's voice was not difficult, but maintaining such stability was. For spellcasters, using a spell wasn't as simple as pressing a button to achieve a certain effect.
Spellcasters' process of using spells is more akin to muscle exertion. Major Moritz's burst of loud noise was the release of as much magical power as possible in an instant, like throwing a punch with all one's might, striving for explosive power.