He clicked off at last and stood up, shaking his head. Suddenly the Med Ship seemed empty. Then he saw Murgatroyd staring at the exit-port. The inner door of that small airlock was closed. The tell-tale said the outer was not locked. Someone had gone out, quietly. The girl. Of course. Calhoun said angrily;

"How long ago, Murgatroyd?"

"_Chee!_" said Murgatroyd indignantly.

It wasn't an answer, but it showed that Murgatroyd was vexed that he'd been left behind. He and the girl were close friends, now. If she'd left Murgatroyd in the ship when he wanted to go with her, she wasn't coming back.

Calhoun swore. Then he made certain. She was not in the ship. He flipped the outside-speaker switch and said curtly into the microphone;

"Coffee! Murgatroyd and I are having coffee. Will you come back, please?"

He repeated the call, and repeated it again. Multiplied as his voice was by the speakers, she should hear him within a mile. She did not appear.

He went to a small and inconspicuous closet and armed himself. A Med Ship man was not ever expected to fight, but there were blast-rifles available for extreme emergency.

When he'd slung a power-pack over his shoulder and reached the airlock, there was still no sign of his late stowaway. He stood in the airlock door for long minutes, staring angrily about. Almost certainly she wouldn't be looking in the mountains for men of Dara come here for cattle. He used a pair of binoculars, first at low-magnification to search as wide an area down-valley as possible, and then at highest power to search the most likely routes.

He found a small, bobbing speck beyond a far-away hillcrest. It was her head. It went down below the hilltop.

He snapped a command to Murgatroyd, and when the _tormal_ was on the ground outside, he locked the port with that combination that n.o.body but a Med Ship man was at all likely to discover or use.

"She's an idiot!" he told Murgatroyd sourly. "Come along! We've got to be idiots too!"

He set out in pursuit.

The girl had a long start. Twice Calhoun came to places where she could have chosen either of two ways onward. Each time he had to determine which she'd followed. That cost time. Then the mountains ended, abruptly, and a vast undulating plain stretched away to the horizon.

There were at least two large ma.s.ses and many smaller clumps of what could only be animals gathered together. Cattle.

But here the girl was plainly in view. Calhoun increased his stride. He began to gain on her. She did not look behind.

Murgatroyd said "_Chee!_" in a complaining tone.

"I should have left you behind," agreed Calhoun dourly, "but there was and is a chance I won't get back. You'll have to keep on hiking."

He plodded on. His memory of the terrain around the mining settlement told him that there was no definite destination in the girl's mind. But she was in no such despair as to want deliberately to be lost. She'd guessed, Calhoun believed, that if there were Darians on the planet, they'd keep the landing-grid under observation. If they saw her leave that area and could see that she was alone, they should intercept her to find out the meaning of the Med Ship's landing. Then she could identify herself as one of them and give them the terribly necessary warning of Weald's suspicions.

"But," said Calhoun sourly, "if she's right, they'll have seen me marching after her now, which spoils her scheme. And I'd like to help it, but the way she's going is too dangerous!"

He went down into one of the hollows of the uneven plain. He saw a clump of a dozen or so cattle a little distance away. The bull looked up and snorted. The cows regarded him truculently. Their air was not one of bovine tranquility.

He was up the farther hillside and out of sight before the bull worked himself up to a charge. Then Calhoun suddenly remembered one of the items in the data about cattle he'd looked into just the other day. He felt himself grow pale.

"Murgatroyd!" he said sharply. "We've got to catch up! Fast! Stay with me if you can, but ..." He was jog-trotting as he spoke--"even if you get lost I have to hurry!"

He ran fifty paces and walked fifty paces. He ran fifty and walked fifty. He saw her, atop a rolling of the ground. She came to a full stop. He ran. He saw her turn to retrace her steps. He flung to the safety of the blast-rifle and let off a roaring blast at the ground for her to hear.

Suddenly she was fleeing desperately, toward him. He plunged on. She vanished down into a hollow. Horns appeared over the hillcrest she'd just left. Cattle appeared. Four--a dozen--fifteen--twenty. They moved ominously in her wake. He saw her again, running frantically over another upward swell of the prairie. He let off another blast to guide her. He ran on at top speed with Murgatroyd trailing anxiously behind.

From time to time Murgatroyd called "_Chee-chee-chee!_" in frightened pleading not to be abandoned.

More cattle appeared against the horizon. Fifty or a hundred. They came after the first clump. The first-seen group of a bull and his harem were moving faster, now. The girl fled from them, but it is the instinct of beef-cattle on the open range--Calhoun had learned it only two days before--to charge any human they find on foot. A mounted man to their dim minds is a creature to be tolerated or fled from, but a human on foot is to be crushed and stamped and gored.

Those in the lead were definitely charging now, with heads bent low. The bull charged furiously with shut eyes, as bulls do, but the many-times-more-deadly cows charged with their eyes wide open and wickedly alert, and with a lumbering speed much greater than the girl could manage.

She came up over the last rise, chalky-white and gasping, her hair flying, in the last extremity of terror. The nearest of the pursuing cattle were within ten yards when Calhoun fired from twenty yards beyond. One creature bellowed as the blast-bolt struck. It went down and others crashed into it and swept over it, and more came on. The girl saw Calhoun, now, and ran toward him, panting, and he knelt very deliberately and began to check the charge by shooting the leading animals.

He did not succeed. There were more cattle following the first, and more and more behind them. It appeared that all the cattle on the plain joined in the blind and senseless charge. The thudding of hooves became a mutter and then a rumble and then a growl. Plunging, clumsy figures rushed past on either side. But horns and heads heaved up over the mound of animals Calhoun had shot. He shot them too. More and more cattle came pounding past the rampart of his victims, but always, it seemed, some elected to climb the heap of their dead and dying fellows, and Calhoun shot and shot.

But he split the herd. The foremost animals had been charging a sighted human enemy. Others had followed because it is the instinct of cattle to join their running fellows in whatever crazed urgency they feel. There was a dense, pounding, horrible ma.s.s of running bulls and cows and calves; bellowing, wailing, grunting, puffing, raising thick and impenetrable clouds of dust which had everything but galloping beasts going past on either side.

It lasted for minutes. Then the thunder of hooves diminished. It ended abruptly, and Calhoun and the girl were left alone with the gruesome pile of animals which had divided the charging herd into two parts. They could see the rears of innumerable running animals, stupidly continuing the charge--hardly different, now, from a stampede--whose original objective none now remembered.

Calhoun thoughtfully touched the barrel of his blast-rifle and winced at its scorching heat.

"I just realized," he said coldly, "that I don't know your name. What is it?"

"M-maril," said the girl. She swallowed. "Th-thank you--."

"Maril," said Calhoun, "you are an idiot! It was half-witted at best to go off by yourself! You could have been lost! You could have cost me days of hunting for you, days badly needed for more important matters!"

He stopped and took breath. "You may have spoiled what little chance I've got to do something about the plans Weald's already making!"

He said more bitterly still;

"And I had to leave Murgatroyd behind to get to you in time! He was right in the path of that charge!"

He turned away from her and said dourly;

"All right! Come on back to the ship. We'll go to Dara. We'd have to, anyhow. But Murgatroyd--"

Then he heard a very small sneeze. Out of a rolling wall of still-roiling dust, Murgatroyd appeared forlornly. He was dust-covered, and draggled, and his tail drooped, and he sneezed again. He moved as if he could barely put one paw before another, but at the sight of Calhoun he sneezed yet again and said, "_Chee!_" in a disconsolate voice. Then he sat down and waited for Calhoun to pick him up.

When Calhoun did so, Murgatroyd clung to him pathetically and said, "_Chee-chee!_" and again "_Chee-chee!_" with the intonation of one telling of incredible horrors and disasters endured.

Calhoun headed back for the valley, the settlement and the Med Ship.

Murgatroyd clung to his neck. The girl Maril followed visibly shaken.

Calhoun did not speak to her again. He led the way. A mile back toward the mountains, they began to see stragglers from the now-vanished herd.

A little further, those stragglers began to notice them. And it would have been a matter of no moment if they'd been domesticated dairy-cattle, but these were range-cattle gone wild. Twice, Calhoun had to use his blast-rifle to discourage incipient charges by irritated bulls or even more irritated cows. Those with calves darkly suspected Calhoun of designs upon their offspring.

It was a relief to enter the valley again. But it was two miles more to the landing-grid with the Med Ship beside it and the reek of carrion in the air.

They were perhaps two hundred feet from the ship when a blast-rifle crashed and its bolt whined past Calhoun so close that he felt the monstrous heat. There had been no challenge. There was no warning. There was simply a shot which came horribly close to ending Calhoun's career in a completely arbitrary fashion.