The Fall of the House of Usher: What happened when Madeline tried to leave Roderick's body behind?

In the episode "The Pit and the Pendulum" of The Fall of the House of Usher, Madeline Usher tries to leave Roderick's body behind after their agreement with Verna, but things do not go as planned. Madeline visits her childhood home, hoping to find Verna and confront her about the destruction she brought upon her family. However, when Madeline tries to snap Verna's neck to amend the terms of their agreement, she quickly realizes that Verna cannot be killed so easily. It is revealed that there is a pact between Madeline, Roderick, and Verna, which can only be fulfilled through death. The exact meaning of this pact is yet to be revealed.Madeline reminds Roderick of the terms of their agreement, stating that they must either enter and exit the world together or there is no deal. Believing that killing himself is the right thing to do and the only way to fulfill the pact, Roderick overdoses on Ligodone. Madeline leaves her brother's body behind, thinking that the pact has been fulfilled. However, Verna swoops in and awakens Roderick from his slumber, indicating that he is not getting out of the agreement that easily.Meanwhile, Frederick Usher, another member of the Usher family, is also making moves to become the CEO of Fortunato Pharmaceuticals. He tortures his wife, Morelle, by isolating her and subjecting her to various cruel acts. Verna becomes disturbed by Frederick's actions and decides to intervene. As Frederick prepares to witness the demolition of the lab, Verna whispers something in his ear and convinces him to add a paralyzer to his cocaine. During the demolition, as Frederick is about to urinate, the paralyzer takes effect, causing him to collapse. Verna delivers a speech about his death and then signals the demolition crew to bring down the building. A swinging beam falls slowly and gruesomely splits Frederick's body in half, marking the death of the last of the Usher children.However, the Usher dynasty is not completely over. Lenore, who has been praised by Roderick as the best of them all, is still alive. In the midst of Roderick's conversation with Dupin, Madeline has been tinkering with something in the basement and has enlisted Lenore's help in her AI project for immortality. With the text messages that Roderick has been receiving from his granddaughter, and considering Madeline's revelations after her encounter with Verna, it is hinted that Lenore may have been transformed into something other than human or something other than living.Overall, "The Pit and the Pendulum" episode reveals the complexities of the pact between the Usher siblings and Verna, as well as the consequences of their actions. The episode leaves viewers wondering about the true nature of the agreement, the fate of Roderick and Lenore, and the ultimate outcome of the Usher family.