It's very subtle here, but just to let people know... Dokja's sword didn't touch Simulacrum. Before the blade got to him, he vanished coz of the fourth wall. That's why Dokja was kind of confused.
@krater maybe the fourth wall is his senpai or maybe he is honored to be be beaten by someone who has the fourth wall. Lol. Who knows, but I don’t think his blushing is in the novel.
@krater @Moth
I read a bit of the novel, IIRC the reason why the dungeon master is blushing is
because before the 4th wall skill was activated, he looked into the MC's mind and saw some of the contents of Ways of Survival that the MC read before, and he was awe or something