Some Inca escaped into the countryside, where the Spaniards pursued and ran them down; nightfall ended the pursuit because the Spaniards could not continue in darkness.

“Some of them escaped into the countryside and the Spaniards rode after them just running them down as they fled and the only thing that stopped the massacre at the end was night was falling and the Spaniards in darkness couldn't continue the pursuit any longer. So it's what happens when something totally outside the universe of even veteran warriors.”