إِذْ لَا مُنَاسَبَةَ بَيْنَ كَرَمِ أَبِي الْحُسَيْنِ وَمَرَارَةِ النَّوَى
For the generosity of Abū al-Ḥusayn and the bitterness of separation seem unrelated.
Coordination can confuse the listener if two assertions have no recognizable reason to be grouped. Separation then prevents the appearance of a shared relation that the speaker does not intend.
The judgment remains contextual. An apparently distant pair may have a subtle link in a poem, argument or conversation. The aim is to identify or rule out an actual connection, not to apply a crude test based on vocabulary alone.