The correct answer is the second one “an absence of love or passion.” In the poem, the general intention of the author is to describe his feelings about the love/passion that it is leaving his life. The sentence “dead leaves and snow”, is the way in which he introduces the absence feeling that he is going through. The birds, as well as the leaves of the tree, are metaphors of love, which are abandoning the tree (his life).
Based on this excerpt, it is reasonable to conclude that neither twin could die because they were immortal gods. The excerpt tells us that none of brothers died, and also it points out that they are the creators that once stepped on separate paths. They are still alive, but not in the sense that we are used to think. Each one has its duty and now they both look at the world from different sides.
Edmund Husserl (1859—1938) was an influential thinker of the first half of the twentieth century. His philosophy was heavily influenced by the works of Franz Brentano and Bernard Bolzano, and was also influenced in various ways by interaction with contemporaries such as Alexius Meinong, Kasimir Twardowski, and Gottlob Frege.