As a rule, these deaths were not witnessed.
Members of the horde simply dropped out of sight.

They left the caves in the morning, and they never came back.

They disappeared--into the ravenous maws of the hunting creatures.
This inroad of the Fire People on the carrot-patch was the beginning of the end, though we did not know it.

The hunters of the Fire People began to appear more frequently as the time went by.

They came in twos and threes, creeping silently through the forest, with their flying arrows able to annihilate distance and bring down prey from the top of the loftiest tree without themselves climbing into it.