parasya svakāraṇavyatiriktasyottarakālaṃ mudgarāder nāśakasyābhāvād ahetukamicchāma iti prakṛtena sambandhaḥ
We consider [destruction] to be without cause because of the absence of any destroyer like a hammer etc. which would be different from its own cause [and] which would come at a later time - this is the connection with the topic at hand.