Ḥamalnāhum ʿalā ḥazmi Thahlān does not mean literally carrying the opponents by hand; the contextual sense is pushing or driving them toward a location. ʿAlā marks that direction or destination.
Shilālan compresses the manner of movement into one word: a force scattering in hurried retreat. Damiya al-ansāʾu is a verbal clause describing the resulting wounds. Action, movement and consequence give the verse its momentum.