What he is after the afternoon and before sunset, that is the upadrava. On it the animals of the forest are dependent. Therefore, when they see a man, they run (upadravanti) to the forest as a safe hiding-place, for they share the upadrava of that Sâman.

In plain words: The sun in late afternoon is the closing-in part of the chant, and wild animals belong to it. That is why they run to the forest to hide when they see a person.