They were moving steadily toward the two watchers on their own. The crimson flashes now came two or three times each minute. Blade saw smoke trails from jet exhausts and what looked like guided missiles. Several times he saw large grayish powder puffs of smoke, and once a huge black blossom with flame in its heart. Bits of debris trailed more smoke down from the explosion. He was seeing an aerial battle, but who was fighting?

Riyannah seemed to know, and she also seemed to care desperately. She stood as if turned to iron, eyes fixed on the battle, hands gripping her belt, face a frozen mask except for lips which moved silently, praying or cursing or doing something else outside Blade's understanding. He put a hand on her shoulder and spoke her name. He wanted to get both of them under cover before the battle got much closer and they were flattened by a stray missile.

It was no use. Trying to move Riyannah was like trying to move a statue. Before Blade could make up his mind to use brute force, the battle was almost on top of them. It took on a pattern, and then it was Blade's turn to freeze and stare at the sky.

He saw three different kinds of flying machines overhead. Two of them wore the red-bordered green triangle of the local government. One kind was the winged disks, the other was needle-nosed delta-wings, small and painted a glossy blue all over. Blade counted about half a dozen of each.

There were only two of the third kind. These were blunt-nosed arrow shapes, with a high tail fin but no wings, canopies, or engines Blade could make out. They were a dull gray all over, except for a black spot under the nose. As he watched, he saw the crimson glow dart out from the black spot, tracing a path through the air but dying out just short of one of the blue delta-wings. Some sort of energy weapon, obviously. Seen close up, it looked vaguely familiar. Blade had the distinct feeling he'd seen it somewhere, but he couldn't have said where to save his life.

It was also obvious that the two gray machines were losing the battle. They were badly outnumbered and one of them was already in trouble. It was slowly losing altitude, its sides were scarred and blackened from several hits, and smoke trailed from the base of its fin.

The other machine was flying a tight formation on its wounded comrade. From the way it whipped around in impossibly tight turns, Blade suspected the crew wasn't entirely human. Riyannah's people, no doubt. He was sure the second machine could have shown its tail to all the triangle-marked planes, and got safely away long ago. Instead it was staying to fight, almost certainly dooming itself as well.

It wasn't entirely a one-sided battle. The crimson beams weren't always accurate, but when they hit they were deadly. Blade saw a feeble flicker from the nose of the damaged machine reaching out and taking one of the disks under its left wing. The wing curled up and tore loose, while the disk lurched, then spun wildly down to smash itself on the rocky hillside. The whole mouth of the valley vanished for a moment in a wall of smoke and flying wreckage, and Blade staggered as the concussion reached him.

That was the last victory of the gray machines. As its victim crashed, a pattern of four missiles bracketed the damaged one. Two hit, one blowing off the fin. The machine tipped up on its tail, pouring out blue smoke and white flame, then plunged vertically to the ground.

This time the explosion was so violent Blade wondered if it was atomic. The concussion knocked both him and Riyannah off their feet. Not only the valley but half the hills vanished behind the smoke, while chunks of metal and stone the size of a man's fist rattled down all around Blade.

The victors scattered in all directions, climbing, diving, making tight turns. One of the delta-wings turned a little too tightly. A wingtip grazed a hilltop and the machine flipped end over end, then vanished down the far side of the hill. Another pillar of smoke marked its end, but the half-deafened Blade never heard the explosion.

He was able to drag a weeping, unresisting Riyannah safely under the cover of the trees before the battle flared up again. The attackers circled at a safe distance from the mass of smoke. Twice disks passed so low overhead that Blade froze. He half-carried Riyannah the last few yards and laid her down on the softest patch of ground he could see, her rifle beside her. As he did, the second gray machine staggered out of the smoke.

It was still under control but it was rapidly losing altitude, belly and fin looking as if they'd been chewed by mice, and one side as black as if it had been painted. The machine fired a last feeble crimson beam, making a patch of rock on the hillside smoke. Then the beam generator seemed to explode, gushing yellowish smoke. Somehow the crew of the machine still kept it under control. Nose high, it floated down and struck the ground. It skidded for a quarter of a mile, lurching from side to side, trailing smoke and sparks. Then it slewed around and came to a stop barely two hundred yards from Blade.

Instantly two troop carriers popped over the hills and came whirring toward the fallen machine. The remaining jets formed a close umbrella over their victim as the troop carriers closed with it.

The fallen machine lay still and silent. Blade noticed that the smoke was diminishing, as the fire burned itself out or the crew got it under control. A hatch opened on the undamaged side of the machine, just ahead of the fin. Blade saw movement in the hatchway, and a moment later the first of the crew climbed out and dropped to the ground.

After so many trips to Dimension X, Blade was about as hard to surprise as a sane human very well could be. This Dimension had given him even more than its share of the unexpected. Yet he still found himself gaping as the crew of the gray machine climbed out.

There were four-beings-in the crew. They were nine feet tall, and resembled nothing so much as gigantic stalks of asparagus. Each had four double-jointed arms, ending in lobster-like claws. They swayed like trees in the wind as they moved.

They were called the Menel, they came from interstellar space and Blade had met them twice before. Both times they'd been enemies. Once he'd found them helping a scientist with a twisted mind create monsters called Ice Dragons, terrorizing and conquering. The other time they'd been trying for conquest on their own, using a Dimension's birds and animals as their weapons.

Both times Blade had tried his best to avoid killing the Menel except when absolutely necessary. He refused to slaughter intelligent aliens when there might be some hope of eventually communicating with them and establishing peaceful relations. He wasn't optimistic. The Menel seemed to be a race bent on conquest, skilled, efficient, brave, in some ways worthy of respect, but also thoroughly dangerous. If the humans of this Dimension were fighting the Menel, what should he do? He still couldn't like the soldiers, but it might not be a good idea to fight them. At least they wouldn't need his help, not if they could always do as well against the Menel as he'd seen them do today.

By now all four Menel were well clear of the crippled machine. Three of them had belts around their bodies just below the arms and various bags and boxes slung from the belts. The fourth was obviously wounded. It staggered more than the others, there was a wide bandage on its head, and every so often one of its comrades would reach out a couple of arms to help it over a patch of rough ground. One Menel was carrying a heavy black tube, one of the portable projectors for the crimson ray. That was the only recognizable weapon in sight.

The four Menel came to a stop, halfway between Blade and the crashed machine. He considered moving Riyannah deeper into the trees, but was afraid of missing even a moment of the Menel's actions. He still knew far too little about them.