Loring did not think it was a broom. The fear which came upon him was primitive, elemental. In some respects it was the kind of fear which a man in a dark wood would experience if he came upon a nest of copperheads while exploring a foliage-choked crevice in search of edible mushrooms. Expecting to find some poisonous varieties perhaps, but hardly death staring up at him out of the opaque eyes of a snake poised to strike.

He moved slowly backwards, keeping the same distance from the entrance but putting as much space as possible between himself and the shuffling. He kept backing away until he came up against a firm metal barrier which he quickly explored with his hands. It had the solid feel of a wall.

His breathing became a little less strained. With a wall at his back he was at least in no danger of being attacked from two directions. And if the wall made further retreat impossible the danger had not increased, for he was still the same distance from the entrance and could still, if he wished, make a very swift dash for it.

He had no immediate intention of doing so. He stood listening, motionless and alert, his shoulders barely touching the wall. The shuffling sound did not seem to be coming any nearer. It even stopped for an instant. The silence closed in about him and he became aware of the over-loud beating of his heart. When the sound started up again it seemed to come from another direction, closer to the entrance.

Now it was nearer. Unmistakably louder and nearer, very close to him in the darkness. He strained his eyes, but could see nothing. He had to depend on his hearing alone, and hearing, he knew, could be deceptive. It was often very difficult to determine the precise location of a sound, to pinpoint it with any certainty.

Suddenly his heart skipped a beat, and his breathing quickened. His throat turned cold as he swallowed, and tightened as well, the muscles stiffening, cording into knots. Unconsciously he gripped his leg, just above the knee, and dug his fingers into the flesh, as if physical pain alone could keep reality from taking on an aspect so nightmarish that his sanity would be imperiled.

The creature was passing directly across the entrance. It was moving so slowly that he could see it distinctly in the sharply sheared-off glow from outside the building. The glow penetrated the darkness hardly at all, but when the creature paused and half turned about even that abruptly curtailed illumination was strong enough to bring it into stark relief.

He saw the monstrous shape clearly. Saw the long, insectlike legs with their tapering hairs, and the very slender, flylike body. Saw its gauzy, tightly folded wings, the metallic glitter of its immense, many-faceted eyes and the slow turning of the eyes as they sought him out in the darkness.

The enormous flying insect framed for an instant in the glow was a shape of terror. It was not its size alone which was making his flesh crawl and his chest heave as his eyes remained fastened upon it in the swimming darkness. He was quite sure of that.

There was something rapacious about it, a deadliness that could be instantly sensed. It seemed intent on his destruction, its enormous eyes filmed with a malignancy that made his blood run cold.