atha kimatra sādhyaviparyaye hetor bādhakaṃ pramāṇaṃ yena hetor vipakṣe pracārāśaṅkā nivartata ity āha ekasyetyādi
"What is the annulling evidence here against the opposite of what is to be proven, by which the suspicion of the reason's occurrence in the counter-instance is removed?" Thus [he] speaks [beginning with] "ekasya" etc.