Answer:
A sentences contains an allusion
is Bill
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,
probably because he knew the odds of them surviving were pretty low and after what he had been through i suppose he wouldn't want them to end up like him.