The end syllable of those sentences is pluta 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 ॥,