AVP Hunters Planet 16

Before either could twitch a trigger, however, something tore through the shrubbery. It was going almost too fast to see, but Brookings, who had excellent eyesight, made out the dim outline of some kind of boomeranglike device. It whooshed through the air. It sliced into the thick worm creature, cleanly lopping off its head. The wormthing writhed in death throes.-Chpt.7 pg.373