The Centaur race strictly belongs to a category of cavalry, and under heavy armor, their large-scale charges are nearly unstoppable against others of the same tier; unfortunately, they encountered the Naga, a race with hardly any weaknesses.
Though their bodies resemble serpents and seem frail, they are actually very strong in both constitution and strength, and their ability to dodge is a notch above their kind.
Especially their in-place dodging ability.
With human torsos and serpentine tails, the thick tails support their bodies. When impacted, a simple bend or collapse of the body can dissipate some of the force, and their several-meters-long tails strewn across the ground act as stumbling blocks to the charging cavalry. A collision leads straight to a fall and tumble.
The Centaurs circling from behind had many fall in their initial charge, forcing the rest to stop in their tracks, drawing swords to engage in a direct clash with the Nagas.
