kiṃ tarhianyeṣāṃ maithunādisamācāradarśanāt paropadeśādvetyāha anyavṛttyupalambhenetyādi /
"What then?" [One might ask], "They arise from seeing others' sexual conduct or from others' instruction" - thus [the opponent] speaks [the verse beginning with] "anyavṛttyupalambhena."