The suspension lasted fourteen hours.
Ethan tracked it with the precision he'd once reserved for particle decay measurements. The tremor returned at 3:47 AM, gentler than before, as though his neurons had been given a reprieve and were only now remembering their decline.
He sat in Abel's study with a notebook open, writing left-handed while he still could. Not observations of the Engine — those he kept locked in his phone, encrypted. This was something else: a list of principles.
*1. The Engine responds to intention.*
*2. Contact costs vitality.*
*3. Observation is cheaper than intervention.*
*4. The Substrate operates at 340:1 time ratio.*
He paused at number five, pen hovering.
*5. Gods grow weary.*
The Engine pulsed once, as if in acknowledgment.
---
Inside the Substrate, the planet Aethon turned beneath twin moons.
The ocean that covered seventy percent of its surface had begun to change. Photosynthetic bacteria clustered into colonial structures — not quite multicellular, but coordinated. They built towers of calcified protein in the shallows, layer upon layer, creating reefs that caught sunlight and divided it into spectrum and shadow.
In the deepest trenches, where no light reached, chemosynthetic organisms fed on volcanic vents. They had no eyes. They would never know the sky existed.
Ethan had watched this divergence for three days of real time — nearly three years in Aethon's accelerated chronology. He hadn't touched the Engine since that first contact, but he'd learned to observe without it. The connection, once established, seemed to persist at low bandwidth. Images arrived in his mind like memories that weren't his: ocean currents, tectonic shifts, the slow patient architecture of evolutionary time.
He saw no sign of Abel's previous interventions. No artificial structures. No jump-started complexity.
Just life, doing what life did: finding purchase in hostile chemistry and refusing to let go.
---
On the morning of the fourth day, Ethan drove to MIT.
His office still existed, though they'd cleared most of his personal effects. The department head had been apologetic but firm: medical leave was medical leave. They'd hold his position as long as policy allowed.
He ignored the elevator and took the stairs, counting steps. Forty-three to the third floor. His left leg dragged on the last five.
The whiteboard in the cosmology lab still showed his final calculation — the fine-structure constant derivation he'd been working on when the diagnosis came through. Someone had written *THANK YOU DR. CROSS* in green marker at the bottom.
He erased it all.
Then he wrote a single equation:
**t_s = 340t_r**
Substrate time equals 340 times real time.
Beneath it:
**E_obs < E_int**
Energy cost of observation less than energy cost of intervention.
And finally:
**L = ∫(E_int)dt**
Lifespan equals the integral of intervention energy over time.
Maya found him there an hour later.
"That's not physics," she said, reading the board.
"No," Ethan agreed. "It's accounting."
She stood beside him, close enough that he could smell her shampoo — something with lavender. "You're calculating how many times you can touch it. Before—"
"Before the cost exceeds the remaining balance." He set down the marker. "Abel used the Engine for forty years. The notes mention hundreds of interventions. Small ones, mostly. Nudging asteroid orbits. Adjusting atmospheric composition. But he aged, Maya. Faster than he should have."
"He was seventy-nine."
"He looked ninety."
Maya absorbed this. Outside, students crossed the quad in autumn sunlight, carrying coffee and complaints about problem sets. Normal people living normal lives.
"What happens if you don't touch it?" she asked. "If you just watch?"
"Then I get five years." Ethan turned to face her. "Maybe four. The ALS doesn't care about my caution."
"And if you do touch it?"
"Then I get to see what comes next."
---
That night, Ethan returned to Abel's study and placed both hands on the Engine.
The warmth came faster this time, eager. The darkness at the center yawned open like a pupil dilating, and he felt himself fall into it — not physically, but in whatever sense consciousness could be said to fall.
He stood on the shores of an alien ocean.
The water was green-black, thick with bacterial mats. The sky burned orange with a sun ten percent larger than Earth's. The air tasted of salt and sulfur.
This was observation at full bandwidth. Embodied. *Expensive.*
Ethan walked to the water's edge and knelt.
In the shallows, a tower of calcified protein rose like a miniature cathedral. Billions of bacteria working in unconscious coordination, building something they would never comprehend.
He reached out — then stopped.
The tremor in his hand had returned.
He pulled back, stood, and looked up at the orange sky. The twin moons were rising, one silver, one rust-red.
"Not yet," he said aloud, to the world or himself or whatever might be listening. "Not until I understand what intervention *costs*."
The scene dissolved.
He woke in Abel's chair with dried blood under his nose and seventeen hours gone from his life.
The Engine had gone cold.