«وَالْعَطْفُ بِهَذِهِ الْكَلِمَةِ إِنَّمَا يَتَحَقَّقُ عِنْدَ اتِّسَاقِ الْكَلَامِ»
Coordination through this particle is realized when the utterance is coherent.
Coherence means that the denial and later affirmation can sensibly function as parts of one connected statement. If a complete legal rejection has occurred and the later words do not coherently qualify it, the intended qualification may fail.
This is not merely a stylistic requirement. It can affect admissions, transactions, and the legal status of property.