yad uktaṃ sa śyāmas tatputratvād ity eṣa trilakṣaṇe 'pi na niścityai pravartata ity atrāha tat putretyādi /
Regarding what was said - that "he is dark because he is that person's son" does not lead to certainty even with three characteristics - [the author] states "that person's son" etc.