In eum haec gloriantem cum globo ferocissimorum iuvenum Romulus impetum facit. Ex equo tum Mettius pugnabat, eo facilius [tanto facilius] fuit eum pellere. Pulsum Romani persequuntur.
From the horse Mettius was fighting by which (means) it was easier to strike him…
I don’t know whether ‘eum’ here means Mettius himself or Romulus. That is, whether fighting on his horse made it easier for Mettius to strike Romulus or easier for Romulus to strike Mettius. It seems that, in the next sentence, he (Mettius) is struck…