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In the example:
What does the word, ‘there,’ indicate?

He came to a sudden halt in front of a tall suit of armor. He had been so busy getting away from the library, he hadn't paid attention to where he was going. Perhaps because it was dark, he didn't recognize where he was at all. There was a suit of armor near the kitchens, he knew, but he must be five floors above there.
Comments  
"There" is where the suit of armor near the kitchens is.
Then, the time orders would be:

(1) He came to a sudden halt in front of a tall suit of armor. (2) He had been so busy getting away from the library, he hadn't paid attention to where he was going. Perhaps because it was dark, he didn't recognize where he was at all. (3) There was a suit of armor near the kitchens, he knew, but he must be five floors above there.

Question 1
Does the perfect tense of ‘hadn’t paid’ was put to indicate “~hadn’t paid~” precedes ‘he arrived the floor five floors above there’?

Question 2
If then, why does the writer say ‘He came to a ~’ instead of ‘He had come to a~’?
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eipjoowhy does the writer say ‘He came to a ~’ instead of ‘He had come to a~’?
That is normal narrative in the literary past tense. It is to be thought of as the present event.
eipjooDoes the perfect tense of ‘hadn’t paid’ was put to indicate “~hadn’t paid~” precedes ‘he arrived the floor above there’?
No. It precedes his coming to a halt in front of the armor.
Oh, I know, so, the former armor and the latter are not the same.
So even though there was an armor near the kitchen, it’s not the one he came across now. And he must be five floors above the kitchen. But he didn’t have an idea where he was. Is this right?
eipjooOh, I know, so, the former armor and the latter are not the same.So even though there was an armor near the kitchen, it’s not the one he came across now. And he must be five floors above the kitchen. But he didn’t have an idea where he was. Is this right?
Right.
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