What is the ruling regarding a conditional oath regarding standing when multiple individuals stand simultaneously before a subsequent action?

Chapter on Explicit Divorce and Others

Al-Mughni

Book of Divorce

Book 39 · Issue 3 · Bab 2

Open in Qurani

Primary text

If two or three individuals stand up simultaneously, and then another person stands afterward, the divorce or emancipation takes effect upon the initial group that stood together, because the term 'first' applies to both a multitude and a single person, as evidenced in the saying regarding the poor emigrants being the 'first to enter Paradise' and the Quranic verse (Quran 2:41).