It can be said that this excerpt is an approach to the "forbidden door". it seems that the reader gets in the mood by reading this description.
The paragraph is full of vivid ideas which makes it simple to picture what is happening and how this person is feeling when listening to that tapping,
Schaffer mistakenly told his assistant to strike alarm Box 342, and as a result, firefighters were directed to an incorrect location during the Chicago fire of 1871.
This is the best example of adding concrete details. It specifically says which alarm box Schaffer told his assistant. The original sentence makes it seem as the miscommunication was the big problem. While it was a problem, the fact that the firefighters went to the incorrect location is really the reason the Chicago fire of 1871 was so devastating. Including these details makes the writing much clearer and easier for the reader to follow.
