1) they cannot leave Madeline there. 2) Roderick panics. 3) the torches almost go out. 4) they decide to place Madeline in her room.
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3) the torches almost go out
The atmosphere in the vault is very oppressive because the trees which narrator sees beyond the house are ugly and condition of house show that there is something serious has occurred in there. And the whole house fills with darkness and silence and these two features or settings are the another name of cruelty. The paintings which are hanging on walls and the facial expression of Usher and Madeline compelled narrator to think that something has happened there which shows oppression.