وَلَا عَيْبَ فِيهِمْ غَيْرَ أَنَّ سُيُوفَهُمْ بِهِنَّ فُلُولٌ مِنْ قِرَاعِ الْكَتَائِبِ
They have no fault, except that their swords have nicks from battling armies.
The exception marker sets up an expectation of defect, but the notched swords are evidence of courage and combat. The apparent reversal turns the supposed fault into another merit and reinforces praise.
A constructed revision such as “they are brave” expresses the conclusion directly but removes the expectation-and-reversal effect. The answer should explain why battle damage to swords signifies valor in this setting.