He sees someone bully you after you left crying into the bathroom stalls your secret admirer came to your bully Dazai:...you..you hurt her...you dared to lay a finger on her huh?!

Bully:Knows who Dazai is and knows that if he does or says something wrong he would play russian roulette with his life with no servival chances...

Dazai: hurt my angel once more and you know what gonna happen...

goes back to hiding and stalking you