Re:Zero kara Hajimeru Isekai Seikatsu

[KrayZ33]

His reaction is like that because he thinks a dream just became reality.... as I said, he thinks it's a game - at least in the beginning.

How's that an excuse? It's just what it is and how it was shown, he basically said so himself when he demanded better starting gear and when he refers to stuff happening as "events".

That's part of the comedy going on, which is why he begged for mercy too instead of running away. He's not supposed to panic like a normal human being because that's not the character he is and not the character this story is about.