As F'lar raced down the passageway to the ledge, firesacks bumping against his thighs, he was suddenly grateful for the tedious sweeping patrols over every Hold and hollow of Pern. He could see Nerat clearly in his mind's eye. He could see the many-petaled vineflowers which were the distinguished feature of the rainforest at this time of the year. Then: ivory blossoms would be glowing in the first beams of sunlight like dragon eyes among the tall, wide-leaved plants.

Mnementh, his eyes flashing with excitement, hovered skittishly over the ledge. F'lar vaulted to the bronze neck.

The Weyr was seething with wings of all colors, noisy with shouts and counter-commands. The atmosphere was electric, but F'lar could sense no panic in that ordered confusion. Dragon and human bodies oozed out of openings around the Bowl walls. Women scurried across the floor from one Lower Cavern to another. The children playing by the lake were sent to gather wood for a fire. The weyrlings, supervised by old C'gan, were forming outside their barracks. F'lar looked up to the peak and approved the tight formation of the wings assembled there in close flying order. Another wing formed up as he watched. He recognized brown Canth, F'nor on his neck, just as the entire wing vanished.

He ordered Mnementh aloft. The wind was cold and carried a hint of moisture. A late snow? This was the time for it, if ever.

R'gul's wing and T'bor's fanned out on his left, T'sum and D'nol on his right. He noted each dragon was well-laden with sacks. Then he gave Mnementh the visualization of the early spring rainforest in Nerat, just before dawn, the vineflowers gleaming, the sea breaking against the rocks of the High Shoal....

He felt the searing cold of between. And he felt a stab of doubt. Was he injudicious, sending them all possibly to their deaths between times in this effort to outtime the Threads at Nerat?

Then they were all there, in the crepuscular light that promises day. The lush, fruity smells of the rainforest drifted up to them. Warm, too, and that was frightening. He looked up and slightly to the north. Pulsing with menace, the Red Star shone down.

The men had realized what had happened, their voices raised in astonishment. Mnementh told F'lar that the dragons were mildly surprised at their riders' fuss.

"Listen to me, dragonriders," F'lar called, his voice harsh and distorted in an effort to be heard by all. He waited till the men had moved as close as possible. He told Mnementh to pass the information on to each dragon. Then he explained what they had done and why. No one spoke, but there were many nervous looks exchanged across bright wings.

Crisply he ordered the dragonriders to fan out in a staggered formation, keeping a distance of five wings' spread up or down.

The sun came up.

Slanting across the sea, like an ever-thickening mist, Threads were falling, silent, beautiful, treacherous. Silvery gray were those space-traversing spores, spinning from hard frozen ovals into coarse filaments as they penetrated the warm atmospheric envelope of Pern. Less than mindless, they had been ejected from their barren planet toward Pern, a hideous rain that sought organic matter to nourish it into growth. One Thread, sinking into fertile soil, would burrow deep, propagating thousands in the warm earth, rendering it into a black-dusted wasteland. The southern continent of Pern had already been sucked dry. The true parasites of Pern were Threads.

A stifled roar from the throats of eighty men and dragons broke the dawn air above Nerat's green heights - as if the Threads might hear this challenge, F'lar mused.

As one, dragons swiveled their wedge-shaped heads to their riders for firestone. Great jaws macerated the hunks. The fragments were swallowed and more firestone was demanded. Inside the beasts, acids churned and the poisonous phosphines were readied. When the dragons belched forth the gas, it would ignite in the air into ravening flame to sear the Threads from the sky. And burn them from the soil.

Dragon instinct took over the moment the Threads began to fall above Nerat's shores.

As much admiration as F'lar had always held for his bronze companion, it achieved newer heights in the next hours. Beating the air in great strokes, Mnementh soared with flaming breath to meet the downrushing menace. The fumes, swept back by the wind, choked F'lar until he thought to crouch low on the lea side of the bronze neck. The dragon squealed as a Thread flicked the tip of one wing. Instantly F'lar and he ducked into between, cold, calm, black. The frozen Thread cracked off. In the flicker of an eye, they were back to face the reality of Threads.

Around him F'lar saw dragons winking in and out of between, flaming as they returned, diving, soaring. As the attack continued and they drifted across Nerat, F'lar began to recognize the pattern in the dragons' instinctive evasion-attack movements. And in the Threads. For, contrary to what he had gathered from his study of the Records, the Threads fell in patches. Not as rain will, in steady unbroken sheets, but like flurries of snow, here, above, there, whipped to one side suddenly. Never fluidly, despite the continuity their name implied.

You could see a patch above you. Flaming, your dragon would rise. You'd have the intense joy of seeing the clump shrivel from bottom to top. Sometimes, a patch would fall between riders. One dragon would signal he would follow and, spouting flame, would dive and sear.

Gradually the dragonriders worked their way over the rainforests, so densely, so invitingly green. F'lar refused to dwell on what just one live Thread burrow would do to that lush land. He would send back a low-flying patrol to quarter every foot. One Thread, just one Thread, could put out the ivory eyes of every luminous vineflower.

A dragon screamed somewhere to his left. Before he could identify the beast, it had ducked between. F'lar heard other cries of pain, from men as well as dragons. He shut his ears and concentrated, as dragons did, on the here-and-now. Would Mnementh remember those piercing cries later? F'lar wished he could forget them now.

He, F'lar, the bronze rider, felt suddenly superfluous. It was the dragons who were fighting this engagement. You encouraged your beast, comforted him when the Threads burned, but you depended on his instinct and speed.

Hot fire dripped across F'lar's cheek, burrowing like acid into his shoulder ... a cry of surprised agony burst from F'lar's lips. Mnementh took them to merciful between. The dragonman battled with frantic hands at the Threads, felt them crumble in the intense cold of between and break off. Revolted, he slapped at injuries still afire. Back in Nerat's humid air, the sting seemed to ease. Mnementh crooned comfortingly and then dove at a patch, breathing fire.

Shocked at self-consideration, F'lar hurriedly examined his mount's shoulder for telltale score marks.

I duck very quickly, Mnementh told him and veered away from a dangerously close clump of Threads. A brown dragon followed them down and burned them to ash.

It might have been moments, it might have been a hundred hours later when F'lar looked down in surprise at the sunlit sea. Threads now dropped harmlessly into the salty waters. Nerat was to the east of him on his right, the rocky tip curling westward.

F'lar felt weariness in every muscle. In the excitement of frenzied battle, he had forgotten the bloody scores on cheek and shoulder. Now, as he and Mnementh glided slowly, the injuries ached and stung.

He flew Mnementh high and when they had achieved sufficient altitude, they hovered. He could see no Threads falling landward. Below him, the dragons ranged, high and low, searching for any sign of a burrow, alert for any suddenly toppling trees or disturbed vegetation.

"Back to the Weyr," he ordered Mnementh with a heavy sigh. He heard the bronze relay the command even as he himself was taken between. He was so tired he did not even visualize where—much less, when—relying on Mnementh's instinct to bring him safely home through time and space.