An agent went rogue once an enemey killed his fam.
It is true that a well-written paragraph should be coherent and unified. These characteristic are some of the most important ones when it comes to writing essays.
True, all those elements are important to budget time.
"Usher rose from a sofa on which he had been lying at full length, and greeted me with a vivacious warmth which had much in it"
In this line, Usher's behavior of rising from the sofa to greet the narrator is a sign of friendly hospitality even though it seems as he rarely gets up from the sofa. Also, the narrator describes his greeting as vivacious. Vivacious means full of life and energy. This is in complete contrast to what we learn about Roderick Usher.While Usher is glad his friend has come, he is not full of life or energy.