Charles Ellicott Commentary Nahum 2:10

"She is empty, and void, and waste; and the heart melteth, and the knees smite together, and anguish is in all loins, and the faces of them all are waxed pale." — Nahum 2:10 (ASV)

And the faces of them all gather blackness. —Better, perhaps, and all faces withdraw their brightness. (See Note on Joel 2:6, where the same expression occurs.)