«وَضَرَبَ أَحْمَدُ وَأَحْمَدٌ آخَرُ»
Translation: “Aḥmad struck, and another Aḥmad did too.”
The first أَحْمَدُ is a specific name with proper-name status plus a verbal pattern. The second أَحْمَدٌ is used indefinitely for another bearer of the name; in this use it takes tanwīn.