Itīs important because of the story itself.The question is not the error in the proggraming sense but the error on the context of the story.Why would Square make an impossible situation just to let us enter Esthar more easily?
That would make no sense.After all the Ragnarok can pass over the wall so there is no need for this.

And the second poll is not a copy.I changed an important word.Since you voted without understanding the question itself a new poll was needed.
I will delete THIS ONE if you want.