Tariq sensed it, this battle of the visions. He slid several paces backward down the slope.

"You cannot control the future," The Preacher whispered, and the sound of his voice was filled with effort as though he lifted a great weight.

Leto felt the dissonance between them then. It was an element of the universe with which his entire life grappled. Either he or his father would be forced to act soon, making a decision by that act, choosing a vision. And his father was right: trying for some ultimate control of the universe, you only built weapons with which the universe eventually defeated you. To choose and manage a vision required you to balance on a single, thin thread - playing God on a high tightwire with cosmic solitude on both sides. Neither contestant could retreat into death-as-surcease-from-paradox. Each knew the visions and the rules. All of the old illusions were dying. And when one contestant moved, the other might countermove. The only real truth that mattered to them now was that which separated them from the vision background. There was no place of safety, only a transitory shifting of relationships, marked out within the limits which they now imposed and bound for inevitable changes. Each of them had only a desperate and lonely courage upon which to rely, but Leto possessed two advantages: he had committed himself upon a path from which there was no turning back, and he had accepted the terrible consequences to himself. His father still hoped there was a way back and had made no final commitment.

"You must not! You must not!" The Preacher rasped.

He sees my advantage, Leto thought.

Leto spoke in a conversational tone, masking his own tensions, the balancing effort this other-level contest required. "I have no passionate belief in truth, no faith other than what I create," he said. And he felt then a movement between himself and his father, something with granular characteristics which touched only Leto's own passionately subjective belief in himself. By such belief he knew that he posted the markers of the Golden Path. Someday such markers could tell others how to be human, a strange gift from a creature who no longer would be human on that day. But these markers were always set in place by gamblers. Leto felt them scattered throughout the landscape of his inner lives and, feeling this, poised himself for the ultimate gamble.

Softly he sniffed the air, seeking the signal which both he and his father knew must come. One question remained: Would his father warn the terrified young guide who waited below them?

Presently Leto sensed ozone in his nostrils, the betraying odor of a shield. True to his orders from the Cast Out, young Tariq was trying to kill both of these dangerous Atreides, not knowing the horrors which this would precipitate.

"Don't," The Preacher whispered.

But Leto knew the signal was a true one. He sensed ozone, but there was no tingling in the air around them. Tariq used a pseudo-shield in the desert, a weapon developed exclusively for Arrakis. The Holtzmann Effect would summon a worm while it maddened that worm. Nothing would stop such a worm - not water, not the presence of sandtrout... nothing. Yes, the youth had planted the device in the duneslope and was beginning to edge away from the danger zone.

Leto launched himself off the dunetop, hearing his father scream in protest. But the awful impetus of Leto's amplified muscles threw his body like a missile. One outflung hand caught the neck of Tariq's stillsuit, the other slapped around to grip the doomed youth's robe at the waist. There came a single snap as the neck broke. Leto rolled, lifting his body like a finely balanced instrument which dove directly into the sand where the pseudo-shield had been hidden. Fingers found the thing and he had it out of the sand, throwing it in a looping arc far out to the south of them.

Presently there came a great hissing-thrashing din out on the desert where the pseudo-shield had gone. It subsided, and silence returned.

Leto looked up to the top of the dune where his father stood, still defiant, but defeated. That was Paul Muad'Dib up there, blind, angry, near despair as a consequence of his flight from the vision which Leto had accepted. Paul's mind would be reflecting now upon the Zensunni Long Koan: "In the one act of predicting an accurate future, Muad'Dib introduced an element of development and growth into the very prescience through which he saw human existence. By this, he brought uncertainty onto himself. Seeking the absolute of orderly prediction, he amplified disorder, distorted prediction."

Returning to the dunetop in a single leap, Leto said: "Now I'm your guide."

"Never!"

"Would you go back to Shuloch? Even if they'd welcome you when you arrived without Tariq, where has Shuloch gone now? Do your eyes see it?"

Paul confronted his son then, aiming the eyeless sockets at Leto. "Do you really know the universe you have created here?"

Leto heard the particular emphasis. The vision which both of them knew had been set into terrible motion here had required an act of creation at a certain point in time. For that moment, the entire sentient universe shared a linear view of time which possessed characteristics of orderly progression. They entered this time as they might step onto a moving vehicle, and they could only leave it the same way.

Against this, Leto held the multi-thread reins, balanced in his own vision-lighted view of time as multilinear and multilooped. He was the sighted man in the universe of the blind. Only he could scatter the orderly rationale because his father no longer held the reins. In Leto's view, a son had altered the past. And a thought as yet undreamed in the farthest future could reflect upon the now and move his hand.

Only his hand.

Paul knew this because he no longer could see how Leto might manipulate the reins, could only recognize the inhuman consequences which Leto had accepted. And he thought: Here is the change for which I prayed. Why do I fear it? Because it's the Golden Path!

"I'm here to give purpose to evolution and, therefore, to give purpose to our lives," Leto said.

"Do you wish to live those thousands of years, changing as you now know you will change?"

Leto recognized that his father was not speaking about physical changes. Both of them knew the physical consequences: Leto would adapt and adapt; the skin-which-was-not-his-own would adapt and adapt. The evolutionary thrust of each part would melt into the other and a single transformation would emerge. When metamorphosis came, if it came, a thinking creature of awesome dimensions would emerge upon the universe - and that universe would worship him.

No... Paul was referring to the inner changes, the thoughts and decisions which would inflict themselves upon the worshipers.

"Those who think you dead," Leto said, "you know what they say about your last words."

"Of course."

" 'Now I do what all life must do in the service of life,' " Leto said. "You never said that, but a Priest who thought you could never return and call him liar put those words into your mouth."

"I'd not call him liar." Paul took in a deep breath. "Those are good last words."

"Would you stay here or return to that hut in the basin of Shuloch?" Leto asked.

"This is your universe now," Paul said.

The words filled with defeat cut through Leto. Paul had tried to guide the last strands of a personal vision, a choice he'd made years before in Sietch Tabr. For that, he'd accepted his role as an instrument of revenge for the Cast Out, the remnants of Jacurutu. They had contaminated him, but he'd accepted this rather than his view of this universe which Leto had chosen.

The sadness in Leto was so great he could not speak for several minutes. When he could manage his voice, Leto said: "So you baited Alia, tempted her and confused her into inaction and the wrong decisions. And now she knows who you are."