अथ यदूर्ध्वमपराह्णात्प्रागस्तमयात्स उपद्रवस्तदस्यारण्या अन्वायत्तास्तस्मात्ते पुरुषं दृष्ट्वा कक्षं श्वभ्रमित्युपद्रवन्त्युपद्रवभाजिनो ह्येतस्य साम्नः ॥ ७ ॥
In plain words
Now, the time from late afternoon until sunset is the upadrava, and to it the wild beasts of the forest belong. Because of this, when they see a human being, they rush away into thickets and ravines in a flurry, for they partake of the turbulent nature of this Sāman's upadrava.
Close to the Sanskrit
Now, that which is after afternoon and before sunset, that is the upadrava; to it the forest animals are connected. Therefore, seeing a person, they rush into a thicket or a pit, for they are partakers of the upadrava of this Sāman.