8.2.97
विचार्यमाणानाम्
Operational rule vidhi
The end syllable of those sentences is प्लुत which denote acts of reflection (or balancing between two alternatives).
Word by word (padaccheda)
Target विचार्यमाणानाम् ṣaṣṭhī · bahuvacana
- Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).
Dotted words are technical terms. Hover or tap one to see its card.
Full reading
विचार्यमाणानाम्
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The end syllable of those sentences is प्लुत which denote acts of reflection (or balancing between two alternatives).
To determine a thing by weighing all arguments pro and con is called vichara or judgment. Thus होतव्यं दीक्षितस्य गृहा ३ इ न होतव्या꣡३म् "should one perform sacrifice in the house of an initiated person". Similarly तिष्ठेद्यूपा३इ, अनुप्रहरेद्यूपा३इ ॥ Here also it is being reflected upon whether यूपे तिष्ठेत् or यूपे अनुप्रहरेत् ॥ i. e. should the stake remain upright or should it be put flat by the yajamana. किं यूपस्तिष्ठेत्, किं वा यूपं यजमानः शाययेत् ॥
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.