how does Bronte build up fear in the passage?

Which passage are you referring to?

The comprehension does not refer to what passage, I wondered if it was to do with Lockwood hearing hasty footsteps approaching his chamber door. Could you please help me? Many thanks.

The next question after how does Bronte build up fear in the passage? is how is this reflected in the way the narrator acts and talks? Could you please help to answer this question too?

It builds up fear by BOOOOOOO!

In what way did it reflected the narrator?♦