Quotation from: Out of Time's Abyss

Written by: Edgar Rice Burroughs

"Sinclair, you may fire," said Bradley quietly." Pick off
the leader. Can't waste ammunition."

The Englishman raised his piece to his shoulder and took quick
aim at the breast of the yelling savage leaping toward them.
Directly behind the leader came another hatchet-man, and with the
report of Sinclair's rifle both warriors lunged forward in the
tall grass, pierced by the same bullet. The effect upon the rest
of the band was electrical. As one man they came to a sudden
halt, wheeled to the east and dashed into the jungle, where the
men could hear them forcing their way in an effort to put as much
distance as possible between themselves and the authors of this
new and frightful noise that killed warriors at a great distance.