"Tiberias gave one scream, and then his throat was torn open and he was selling his otter skins in Hell. The mule ran away into the woods. Listen! Even now you can hear him thrashing about under the trees. The demon didn't have time to take Tiberias' head; it took fright as we came up."

"As you came up," amended Balthus. "It must not be a very terrible creature if it flees from one armed man. But how do you know it was not a Pict with some kind of a hook that rips instead of slicing? Did you see it?"

"Tiberias was an armed man," grunted Conan. "If Zogar Sag can bring demons to aid him, he can tell them which men to kill and which to let alone. No, I didn't see it. I only saw the bushes shake as it left the trail. But if you want further proof, look here!"

The slayer had stepped into the pool of blood in which the dead man sprawled. Under the bushes at the edge of the path there was a footprint, made in blood on the hard loam.

"Did a man make that?" demanded Conan.

Balthus felt his scalp prickle. Neither man nor any beast that he had ever seen could have left that strange, monstrous, three-toed print, that was curiously combined of the bird and the reptile, yet a true type of neither. He spread his fingers above the print, careful not to touch it, and grunted explosively. He could not span the mark.

"What is it?" he whispered. "I never saw a beast that left a spoor like that."

"Nor any other sane man," answered Conan grimly. "It's a swamp demon — they're thick as bats in the swamps beyond Black River. You can hear them howling like damned souls when the wind blows strong from the south on hot nights."

"What shall we do?" asked the Aquilonian, peering uneasily into the deep blue shadows. The frozen fear on the dead countenance haunted him. He wondered what hideous head the wretch had seen thrust grinning from among the leaves to chill his blood with terror.

"No use to try to follow a demon," grunted Conan, drawing a short woodman's ax from his girdle. "I tried tracking him after he killed Soractus. I lost his trail within a dozen steps. He might have grown himself wings and flown away, or sunk down through the earth to Hell. I don't know. I'm not going after the mule, either. It'll either wander back to the fort, or to some settler's cabin."

As he spoke Conan was busy at the edge of the trail with his ax. With a few strokes he cut a pair of saplings nine or ten feet long, and denuded them of their branches. Then he cut a length from a serpent-like vine that crawled among the bushes near by, and making one end fast to one of the poles, a couple of feet from the end, whipped the vine over the other sapling and interlaced it back and forth. In a few moments he had a crude but strong litter.

"The demon isn't going to get Tiberias' head if I can help it," he growled. "We'll carry the body into the fort. It isn't more than three miles. I never liked the fat fool, but we can't have Pictish devils making so cursed free with white men's heads."

The Picts were a white race, though swarthy, but the border men never spoke of them as such.

Balthus took the rear end of the litter, onto which Conan unceremoniously dumped the unfortunate merchant, and they moved on down the trail as swiftly as possible. Conan made no more noise laden with their grim burden than he had made when unencumbered. He had made a loop with the merchant's belt at the end of the poles, and was carrying his share of the load with one hand, while the other gripped his naked broadsword, and his restless gaze roved the sinister walls about them. The shadows were thickening. A darkening blue mist blurred the outlines of the foliage. The forest deepened in the twilight, became a blue haunt of mystery sheltering unguessed things.

They had covered more than a mile, and the muscles in Balthus' sturdy arms were beginning to ache a little, when a cry rang shuddering from the woods whose blue shadows were deepening into purple.

Conan started convulsively, and Balthus almost let go the poles.

"A woman!" cried the younger man. "Great Mitra, a woman cried out then!"

"A settler's wife straying in the woods," snarled Conan, setting down his end of the lifter. "Looking for a cow, probably, and — stay here!"

He dived like a hunting wolf into the leafy wall. Balthus' hair bristled.

"Stay here alone with this corpse and a devil hiding in the woods?" he yelped. "I'm coming with you!"

And suiting action to words, he plunged after the Cimmerian. Conan glanced back at him, but made no objection, though he did not moderate his pace to accommodate the shorter legs of his companion. Balthus wasted his wind in swearing as the Cimmerian drew away from him again, like a phantom between the trees, and then Conan burst into a dim glade and halted crouching, lips snarling, sword lifted.

"What are we stopping for?" panted Balthus, dashing the sweat out of his eyes and gripping his short sword.

"That scream came from this glade, or near by," answered Conan. "I don't mistake the location of sounds, even in the woods. But where — "

Abruptly the sound rang out again — behind them ; in the direction of the trail they had just quitted. It rose piercingly and pitifully, the cry of a woman in frantic terror — and then, shockingly, it changed to a yell of mocking laughter that might have burst from the lips of a fiend of lower Hell.

"What in Mitra's name — " Balthus' face was a pale blur in the gloom.

With a scorching oath Conan wheeled and dashed back the way he had come, and the Aquilonian stumbled bewilderedly after him. He blundered into the Cimmerian as the latter stopped dead, and rebounded from his brawny shoulders as though from an iron statue. Gasping from the impact, he heard Conan's breath hiss through his teeth. The Cimmerian seemed frozen in his tracks.

Looking over his shoulder, Balthus felt his hair stand up stiffly. Something was moving through the deep bushes that fringed the trail — something that neither walked nor flew, but seemed to glide like a serpent. But it was not a serpent. Its outlines were indistinct, but it was taller than a man, and not very bulky. It gave off a glimmer of weird light, like a faint blue flame. Indeed, the eery fire was the only tangible thing about it. It might have been an embodied flame moving with reason and purpose through the blackening woods.

Conan snarled a savage curse and hurled his ax with ferocious will. But the thing glided on without altering its course. Indeed it was only a few instants' fleeting glimpse they had of it — a tall, shadowy thing of misty flame floating through the thickets. Then it was gone, and the forest crouched in breathless stillness.

With a snarl Conan plunged through the intervening foliage and into the trail. His profanity, as Balthus floundered after him, was lurid and impassioned. The Cimmerian was standing over the litter on which lay the body of Tiberias. And that body no longer possessed a head.

"Tricked us with its damnable caterwauling!" raved Conan, swinging his great sword about his head in his wrath. "I might have known! I might have guessed a trick! Now there'll be five heads to decorate Zogar's altar."

"But what thing is it that can cry like a woman and laugh like a devil, and shines like witch-fire as it glides through the trees?" gasped Balthus, mopping the sweat from his pale face.

"A swamp devil," responded Conan morosely. "Grab those poles. We'll take in the body, anyway. At least our load's a bit lighter."

With which grim philosophy he gripped the leathery loop and stalked down the trail.