This stz. is in वंशस्थ metre. But strangely enough our author looks upon this as an instance of छन्दोभ्रष्टदोष, for according to him in the third line the गण scheme would not be ज त जर as required in वंशस्थ, but य त जर as न in प्रसून precedes a conjunct consonant viz. कॢ. But being a vowel कॢ cannot be called a conjunct (संयोग, हलोऽनन्नरा: संयोगः - पा. १. १.७). Perhaps here the author wants to display his minute knowledge of grammar; for acc. to पा. ८. २.१८ "कृपो रो लः" there is a portion of ल् in कॢ and as stated in the Mahabhasya वर्णकदेशग्रहणे वर्णग्रहणम्, कॢ in कॢपि may be looked upon as a conjunct made up of क् and ल्, as such making the preceding न prosodically long.