“I’ll bet you didn’t,” Jack muttered.
“What’s next?” Bob whispered.
But before the Indian could reply a sound broke the silence.
“What in the world was that?” Jack gasped.
“Listen,” Bob whispered.
Again the sound came to their ears. Beginning with a low rumble it grew louder until it ended in a piercing shriek.
“What is it, Kernertok?” Bob asked.
“Injun no know,” he replied.
“It’s only some more of their attempts to scare us,” Jack declared.
“And we don’t scare worth a cent,” Bob added.