Crack! crack!
Two pistol shots made up the reply.
"I'm afraid I've got to kill him, if he doesn't get me first."
Bang!
"Ow—ow—ow—ow!" That yell was genuine enough to show that the young sentry's bullet had struck flesh.
"Do you surrender?"
"Not to you!"
Hal fired again. Then he crouched low, slipping two more cartridges into his rifle.
Crack! crack!
"I'll get you yet," called a furious voice.