وَلَا عَيْبَ فِيهِمْ غَيْرَ أَنَّ سُيُوفَهُمْ بِهِنَّ فُلُولٌ مِنْ قِرَاعِ الْكَتَائِبِ
They have no fault, except their swords bear notches from battle.
The exception marker sets up an expectation of fault, but notched swords from repeated combat testify to courage. The apparent reversal strengthens praise. Replacing the line with “they are brave” conveys the compliment but loses the surprise and intensification.
The mere presence of “except” is not enough to establish the device. The supposed exception must be interpreted: does it express an actual defect or another commendable quality?