Anakin circled in a slowly ascending spiral over the center of the shield and about a hundred meters above it. A second golden figure performed a quick, leaflike downward spiral about a hundred meters above Anakin. A third and fourth were ascribing broad arcs around the perimeter.

Obi-Wan focused on Anakin. He prepared his wings for an other liftoff, just as he saw his Padawan tuck like a diver and drop out of sight through the shield's central hole.

Obi-Wan ran to the lip of the nearest port, about twenty meters distant. He made sure his wings were properly folded and could be easily swept out and expanded. His feet broke through gluey tractor fields on the shield's curved surface. The air sizzled around him. His insides felt as if he were marching through the worst thunderstorm on the most violent gas-giant planet.

Drifts of frozen moisture flurried around him in the wake of a canister as it screamed through a port less than fifty meters to his right. The cyclonic updraft nearly lifted him from his feet, and he did not know if he could muster the strength to stand upright once more against the local field lines.

Obi-Wan Kenobi, like Qui-Gon Jinn, was no supporter of training by punishment. Recognition of mistakes by the apprentice was almost always sufficient. Still, with shame, he saw in a dark part of his thoughts that he was planning harsh words, extreme trials, and many, many extra chores for Anakin Skywalker, and not just to improve his Padawan's perspective on life.

Anakin felt a pure kind of joy as he spread his wings and caught a field on the next lower level. The beauty of the ion trails, the lightning that played continuously between plumes of discharge smoke and brightened the distant walls of the pit, the drumbeat roar every five seconds of ascending canisters was beautiful, but more important, they all, with one almost-living voice, called out a challenge greater than anything he had experienced on Tatooine, including the Boonta Eve Podrace.

This was a place most would find terrifying, where most beings would certainly die, yet he was only a boy, a mere child, a former slave, relying not on Jedi training so much as raw native courage. He was alone, happy to be alone! He would gladly live out the rest of his life in this kind of immediate peril if he could simply forget the past failures that haunted him at night, whenever he tried to sleep. The failures-and the terrifying sense of carrying something beyond his power to control.

The dark empty boots that trod the worst of his nightmares.

Again, he picked out his port, near the shield center, where few canisters were launched. He could feel the pulse of the huge gun carriage beneath this lowest shield. His senses were tuned to the rhythm of that rotating launcher, bigger than the entire Jedi Temple. Anakin listened for the hesitation, the brief silence followed by a bass grind and chuff before a ring of canisters was chambered and fired. Best, of course, to drop through a port during a lull between discharges, and away from a port where a canister had recently passed, with its flux of gases, updrafts, light ning, and blue ion trails.

Before he made his decision, Anakin marveled at a phenome non he had only heard about from other racers in tones of awe: rising circles of plasma spheres, drifting as if imbued with purpose in the void above the first shield. They glowed orange and greenish blue, and he could even hear their fierce sizzle. To touch them was to be instantly fried. He watched a circle of these spheres explode with tinny pops, and through the space where they had been, a particularly fierce bolt of lightning flew like a javelin through a hoop.

This raised his neck hair in a way no static discharge could explain. It was as if he faced the primitive gods of the garbage pit, the real masters of this place, yet to think this even for a moment went against all of his training. The Force is everywhere and demands nothing, neither obeisance nor awe.

But this, of course, was what he needed to experience in order to forget. He needed to strip down to pure savagery, to that place below his name, his memory, his self, where ominous shadows dwelled, and where one could turn in an instant from the light side of the Force to the dark and hardly know they were different.

Anakin, pure instinct, a mote of dust in the game, tucked his wings once more and dropped through the central port in the shield.

He did not notice, fifty meters above him, that the Blood Carver did the same.

The gun carriage sat on its elevated mount two hundred meters below the shield, going through its automated motions. From tracks on all sides it received loaded and charged canisters, each falling into a firing chamber with only a bulbous tip protruding. Each canister bore a specific designation in the carriage program, a specified route through the four shields, with four chances to be accelerated into a specific orbit. The charge beneath the canister would carry it only the first three hundred meters, to the first shield. Thereafter the tractor fields and magnetic-pulse engines took over. It was a sophisticated yet centuries-old design, rugged, durable, duplicated all over Coruscant.

The air above the rotating carriage was almost unbreathable. Fumes from the exploding charges-simple chemical explosives- could not be vented and processed fast enough to prevent a toxic pall forming below the first shield. Added to this perpetual burnt-rubber haze were the miasmic vapors from the silicone-filled basin below the gun carriage.

It was here that the most primitive-not to mention the largest-creatures on Coruscant lived and performed their functions in a perpetual twilight, illuminated only by the fitful glows of work lights hung from the undersides of the gun carriage supports. The largest worms were hundreds of meters long and three or four meters wide.

Anakin glided to one side of the lowest level and alighted on a carriage support. He could feel through his feet the rotation and launching of the chambered canisters. The immense mass of the ferrocarbon structure shuddered under his flight slippers.

He had conserved most of his fuel for this moment. The tractor fields below the carriage were weak, sufficient only to discourage the worms from rising to suck at the supports. Once he had plucked loose a glassy worm scale, he would have to jet upward to the first shield and catch a canister updraft, then be pulled through a port to the void above the first shield.

This would be insanely difficult.

All the better. Anakin, eyes wide open, surveyed the dim, chaotic brew of worms below. He locked one wing briefly, pulled loose an arm, and wrapped a breather mask over his mouth and nose. He then took this opportunity to attach his optical cup and pulled down bubble goggles to protect his eyes from the silicone spray. Then he tensed to leap.

But he had made a Jedi apprentice's first mistake-to direct all one's attention to a single goal or object. Focus was one thing, narrow perception another, and Anakin had ignored everything above him.