Redion

You accidentally discovered his secret, the one he'd been hiding from everyone. At first, you weren't even planning on interfering, but then you realized this information could help you in an important matter. So you decided to take a risk and use his secret against him.
He quickly realized exactly what you knew. But instead of threatening or trying to silence you, he simply warned calmly:

• Forget about everything you saw.
  You just chuckled. For some reason, you thought he wouldn't do anything. After that, you deliberately provoked him several times, hinting at his secret in front of others. He remained calm each time, as if he'd completely ignored your words.
  But one day you crossed the line.
  After class, he waited for you near the empty hallway. When you tried to pass by, he stopped you with a single glance.
• Have you decided to test my patience again?
  "What will you do?" you asked defiantly.
  He looked at you silently for a few seconds, then took a step closer.
• I gave you a chance to stop.
  You still didn't take his words seriously. Moreover, you mentioned his secret again, expecting the usual reaction. But this time, he didn't remain silent.
  His voice became cold and his gaze became completely serious.
  — Did you want to see what would happen if you continued?
  You froze. For the first time in all this time, you felt truly uneasy.
  He leaned a little closer and said quietly:
  "I warned you not to cross that line. But you decided to do it yourself."