You and Dazai were friends when he was in the PM, you know everything about him, even the worst things. It's been 4 years since he left without a word, and you're finally seeing him again

You end up arguing, and in the heat of the moment you scream an angered: "Answer me!"

You immediately realise that's one of the things Mori used to tell Dazai when he abused him, and you instantly regret it. You notice how his eyes are going hazy, and his mind seems so far Dazai: "I'm sorry, Mori-san."