व्यन् सपत्ने

Operational rule vidhi

The affix व्यत् comes after the word भ्रातृ when the sense is that of 'an enemy'.

Word by word (padaccheda)

Substitute / term व्यन् prathamā · ekavacanaRight context सपत्ने saptamī · ekavacana

Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
Right context Saptamī (7th case): "when X follows", the operation applies to what precedes (1.1.66 तस्मिन्निति निर्दिष्टे पूर्वस्य). Also a condition or domain ("in the sense of").

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Full reading

व्यन् सपत्ने

Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.

Commentary

The affix व्यत् comes after the word भ्रातृ when the sense is that of 'an enemy'.
The word सपत्न means 'enemy'. The sense of descendant is not connoted by this affix. The difference between व्यन् and व्यत् is in accent 6.1.185 and 6.1.197. Thus पाप्मना भ्रातृव्येण "by the sinful enemy". भ्रातृव्यः कण्टकः "the enemy is a thorn".

Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.