أَلَا أَبْلِغْ ... فَكَيْفَ وَجَدْتُمُونَا
Listen, convey ... what did you find us like?
Alā attracts attention; abligh commands the delivery of a message; kayfa introduces a question. Their sequence creates a dramatic address.
Naming specific opponents turns general boasting into an implied cross-examination: the speaker expects them to confirm a reputation for strength.