pictures and the sight of the thousands of snakelike, wriggling antennae nauseated him.

George hesitated briefly and then ran toward the Agronians. Again Emmett followed the pilot's lead. One of the creatures aimed a weapon before George had crossed half the distance and Gloria's shrill scream of warning brought him up short. But before the weapon could be discharged, the other Agronian viciously flung a tentacle and sent it spinning from his companion's clasp.

George leaped at the nearest Agronian but the creature easily eluded him. He made another attempt and failed again.

The man and the alien cautiously surveyed each other.

"They're too fast for us," George admitted. His voice was filled with the bitterness of defeat and his shoulders sagged visibly.

"Do something!" Gloria screamed. "Do something before the others come back!"

Emmett glanced apprehensively at the air lock. She was right. At the moment they outnumbered the enemy, but when the others returned the Agronians could overpower them by sheer weight of number. And they could return without warning, at any instant.

"Why did one prevent the other from killing us?" George asked.

"He may have been afraid the other would miss and damage the ship," Emmett said. "Or possibly—"

"No. They're trained from birth to be soldiers. They're expert marksmen and their weapons are foolproof. They can adjust the blast from a weapon to travel any distance."

"Why should one enemy prevent another from killing us?" Emmett repeated wonderingly. He remembered another question that had nagged at his mind: Why had the Agronians totally destroyed Earth? Why hadn't they eliminated Earthmen and preserved the planet for exploitation—as a colony, a military base, any one of a thousand uses?

There was only one possible answer. A race might destroy a planet if it was useless. Earthmen had discovered useless planets, planets with poisonous atmospheres. Was Earth's atmosphere poisonous to the Agronians?

One Agronian had prevented another from killing them with a viciousness and an urgency that indicated it had been a life-and-death necessity.

Why? What would happen if they were to die?

Something 

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