“They mustn’t give him a chance,” muttered Fred doggedly.
“They won’t if they can help it, you may be sure of that.”
“There he goes!” cried Fred. “No, not yet,” he corrected himself.
“He’ll strike, all right. Just watch him.”
“If Sam can only use that knife.”
“Maybe he won’t attack Sam.”
“They’re awfully close together now,” said Fred. “If he goes for John, Sam can stick him and if he goes for Sam, why he has the knife right there.”
“The old knife will never go through that shark’s hide,” exclaimed Grant. “It’s almost as hard as sheet steel.”
“Here’s the test anyway,” cried Fred, and as he spoke the giant fin could be seen darting suddenly towards the two swimmers. Just before it reached them it disappeared beneath the surface of the water.
“He has turned bottom side up to bite,” muttered Grant, fully understanding just what was taking place.