Roger and Tom lay flat on the ground and trained their rifles on the approaching beast.
"I'll take the right leg," said Roger. "You take the left, Tom."
"On target!" replied Tom, squinting through the sight.
"Ready!" Connel's voice roared across the trail.
Only a hundred and fifty feet away the tyrannosaurus, hearing Connel's voice, suddenly stopped. Its head weaved back and forth as though it suspected a trap.
Tom and Roger fired together, but at the same moment the monster lunged toward Connel's position. Both shots missed, the energy charges merely scorching its sides.
The tyrannosaurus roared with anger and turned toward the boys, head down and the claws of its short forelegs extended.
At that moment Connel opened fire, aiming for the monster's vulnerable neck. But it was well protected behind its shoulders and the spaceman only succeeded in drawing the beast's attention back to himself.
At this instant Tom and Roger opened fire again, sending violent shock charges into the beast's hide. Caught in the withering cross fire, it turned blindly on the boys and charged at them. The two cadets fired coolly, rapidly, unable to miss the great bulk. The air became acrid with the sharp odor of ionized air. Maddened now beyond the limits of its endurance, hit at least twenty times and wild with pain, the great king of the Venusian jungle bore down on the two cadets.
Roger and Tom saw that their fire was not going to stop the tyrannosaurus's charge. They were pouring a nearly steady stream of fire into the monster now, while on the other side of the trail Connel was doing the same, raking the monstrous hulk from the forelegs to the hindquarters.
The boys jumped back, Tom still facing the beast and firing his rifle from the waist. But Roger stumbled in the tangle of the underbrush and fell backward, dropping his rifle. The beast's head swooped low, jaws open.
Seeing Roger's danger, Tom jumped downward again without hesitation and fired point-blank at the beast's scaly head, only ten feet away.
The monster roared in sudden agony and pulled back, jerking his head up against a thick branch of the tree overhead. The limb tore loose under the impact and fell crashing to the ground on top of Roger.