The Fall of the House of Usher: Why does Madeline try to amend the terms of the agreement with Verna?

In the seventh episode of The Fall of the House of Usher, titled "The Pit and the Pendulum," Madeline tries to amend the terms of the agreement with Verna because she is tormented by the death of her sister Tamerlane and her encounter with Verna. Madeline goes back to her childhood home to confront Verna and potentially find a way out of their agreement. It is revealed that there is a pact between Madeline, Roderick, and Verna, although the exact nature of the agreement is not clear. However, it is understood that this pact can only be fulfilled through death.Madeline attempts to change the terms of the agreement and even tries to kill Verna to free herself and her brother from the pact. However, Verna proves to be unkillable or at least incredibly difficult to kill. The contract stipulates that they must enter the world together and leave the world together, or there is no deal. This prompts Madeline to remind Roderick of the terms as they sit together in the basement of Fortunato's, facing a brick wall. It becomes apparent that Madeline believes the only way out is for Roderick to kill himself with a Ligodone overdose.Convinced that this is the right thing to do, Madeline leaves her brother's body behind, believing that he has fulfilled his part of the agreement. However, Verna swoops in and awakens Roderick from his slumber, indicating that he cannot escape the pact so easily.Meanwhile, Madeline is not the only Usher trying to gain power now that Roderick's position as CEO of Fortunato is at risk. Frederick, another Usher sibling, is also vying for the position and going behind his father's back to secure the necessary votes. In an act of extreme cruelty, Frederick tortures his wife Morelle by isolating her and subjecting her to various forms of abuse. This includes disfiguring her mouth with a pair of pliers, as punishment for what he perceives as a deceiving smile she offered him the day they first met.Verna, who has grown accustomed to the Ushers' selfishness and cruelty, finds Frederick's actions to be a step too far. She whispers something in his ear, causing him to add a paralyzing drug to his stash of cocaine. Unaware of the added substance, Frederick goes to witness the demolition of a lab, where he intends to retrieve Morelle's wedding ring and desecrate Prospero's once-glorious final resting place. However, the paralyzer takes effect, and Frederick collapses. Verna appears and berates him for pushing her hand with his sadistic actions. She then impersonates Frederick's voice through a walkie-talkie to give the demolition crew the go-ahead, causing a beam to fall and split Frederick's body in half.With Frederick's death, the Usher siblings have all met their demise. However, there is still a glimmer of hope for the Usher dynasty. Roderick and Madeline's granddaughter, Lenore, is still alive, although her state of being may have been altered through Madeline's experimentation with artificial intelligence and immortality. The episode leaves us questioning if Lenore is still fully human or if she has become something other than living.In summary, Madeline attempts to amend the agreement with Verna because she is burdened by the deaths within her family and seeks a way to escape the destructive pact. However, Verna proves to be elusive and seemingly unkillable. Meanwhile, Frederick goes to great lengths to secure the position of CEO but meets a gruesome end due to Verna's manipulation. Amidst all of this, the Usher dynasty's fate hangs in the balance, with the uncertainty of Lenore's existence and potential transformation. The episode raises more questions and sets the stage for an intense and mysterious finale.