I didn't give it too much thought before, but here's the fun fact of the day:
"Zastal vrasplokh" from Russian translates to "caught off guard" (Zastal being a verb)
I'd say specifically The little Mermaid was adapted in countries all over the world, and is one of the most known Andersen's works, especially after Disney's one came out
You have a strange definition of a normal person. Also you do know people can get paralyzed by fear and terror, right?
Also most of the comments were discussing the skill choice
I don't need manga to tell me explicitly that he has only seconds to react. MC didn't look idiotic to me. It was obvious from how a normal person would react in first few deaths, and the fact that he had zero fighting skills.
Should be obvious that MC saw the hidden room the first/second time...