“We know it can,” Nettle said. “Now we find out what that knowledge is worth.”
The silver light hung beyond the broken slope, thin as a blade held upright in the valley. It had bent toward me twice. The second time, I had looked away first.
That detail kept tugging at me while Merrit folded the copper-thread screen and Sable sealed her notes. We had learned that the seam could perceive me without the marker, without an active array, and without any convenient magical road leading back to it. Useful facts. Horrible facts. The sort of facts that made a report longer while doing very little for anyone’s sleep.
Nettle watched the valley through narrowed eyes. “Pack the lens. Leave the marker dark.”
Merrit latched the case. “We returning to Brindlehook?”
“We’re moving fifty paces down the slope first.”
Shining’s ears angled toward her. “Closer?”
“Laterally. The line of sight changes. David stays screened until we establish the new position.”
I lifted a hoof. “Before we conduct the next exciting episode of David Is a Scientific Instrument, can I ask what we’re hoping to learn?”
Twilight glanced at me. Her expression carried the beginning of a defense, then she let it go.
Nettle turned from the valley. “Ask.”
“What does any of this buy us? We prove it sees me. Then we prove it sees me from a different angle. At what point does the result become useful to ponies who aren’t standing on a mountainside with an unstable unicorn?”
The question had been waiting behind my teeth for three days. I had kept swallowing it because everyone was busy carrying equipment and because the answers might involve me. It came out sharper than intended.
Nettle did not flinch. She rested one hoof on the lid of the marker case.
“Three uses,” she began. “First, we determine whether the light responds to David specifically or to any foreign resonance. That tells the Office whether this is an environmental hazard or an individual attachment. Second, we learn what conditions trigger a response. Sight, distance, memory, magic, movement. That becomes a safety rule. Third, we establish whether the response can form a route without an active array.”
“We already know it can’t,” I said.
“We know it did not form one during a short observation. Field reports are built from repeated results.”
I looked toward the valley. “And the public benefit?”
“People stop wandering into a valley that can imitate voices, respond to personal memories, and perhaps notice an outsider from miles away.”
Next
At Brindlehook, Nettle will report the valley’s selective response while Twilight searches for a safe magical substitute—one that may reveal whether David is uniquely recognized or merely the first foreign resonance the seam has found.
Nettle continued, “If we learn the trigger, we can warn travelers before they activate it. If we learn the range, we can mark a boundary. If the seam can only make contact through an energized array, we dismantle the equipment and close the investigation. If it can establish contact by itself, we report a regional threat.”
Twilight lowered her gaze to the notes in her saddlebag. “And if it is connected to David’s arrival, understanding the response may tell us whether another crossing is possible.”
The valley light brightened.
I felt heat collect beneath my horn. My knees remained steady, but the sensation put a hand against the back of my neck. The light had heard nothing. It had no ears. That was an assumption, and we had enough bad assumptions already.
“Fine,” I said. “That’s an answer I can work with. What’s the next question?”
Nettle pointed to the ridge. “Whether it follows your attention or merely your eyes.”
Twilight’s head came up. “We can test that without exposing him to the lens.”
“Explain it.”
“David looks at the light through the lens. We record the response. Then he closes his eyes while keeping his head fixed. If the light remains oriented toward him, visual contact may be incidental. If it fades or turns away, attention may require sight.”
“And if I have to close my eyes for science,” I added, “I request that science provide a snack afterward.”
Mallow’s voice seemed to echo from the station all the way up the ridge. “There’s dried apple in the second pack.”
I stared at the nearest ponies.
Merrit’s mouth twitched. Shining looked toward the road. Twilight’s ears turned pink beneath her mane.
“Your field assistant has an excellent supply philosophy,” I decided.
“Nettle,” Sable said, her quill poised over the slate, “is this observation authorized under the existing order?”
Nettle’s eyes moved to me, then to Twilight. “It remains observational. No approach. No array. David may stop at any point.”
I nodded. “And if my legs start filing complaints?”
“Report it before they become an argument.”
Twilight moved the tripod behind the rock shelf. Shining checked the ground around me and found a flat patch where I could brace myself against the stone. The arrangement had the careful, mildly humiliating efficiency of a medical appointment. I had learned to prefer that feeling to heroic improvisation.
The lens came uncovered.
The silver light waited in the valley. I found it through the crystal, and the familiar pressure gathered behind my eyes. A pale filament leaned across the broken ground, stopping well short of the dark marker.
“Response confirmed,” Sable recorded.
“Close your eyes,” Twilight instructed.
I did.
The world became wind, stone, and the small movements of ponies trying not to move. My horn stayed warm. The pressure behind my eyes held steady.
“Any change?” Nettle asked.
“Still there,” I said. “I can’t see it, obviously. My relationship with visual information has entered a temporary separation.”
“Keep your head fixed.”
I held still. The stone pressed against my shoulder. Somewhere below, Merrit’s pack buckle clicked. My body knew the slope was there even with my eyes shut. It knew Shining stood near enough to catch me and Twilight stood near enough to stop the test. Those facts mattered more than the valley’s light.
“Twilight?” Nettle’s hoof scraped against the ground. “Report.”
“The filament has shortened.”
My eyes opened before I could stop myself. The light had withdrawn to its original position, a silver vertical line in the distant rock.
Twilight’s face was taut with concentration. “It weakened when he closed his eyes.”
“Did it disappear?”
“No. It remained oriented toward the observation point.”
Nettle wrote the result herself. “Sight is part of the trigger, but not the whole of it.”
That answer left a cold space in my chest.
“Can I turn away?” I asked.
Nettle studied me. “You may. Slowly.”
I turned my head from the valley. The horn heat eased by a fraction. Twilight watched the lens. Sable recorded the time. Shining shifted closer when my balance wavered, and I accepted his shoulder without pretending I had not needed it.
“The filament is fading,” Twilight reported. “Still present.”
I kept my head turned. “How long?”
“Six seconds. Eight. It’s almost gone.”
The pressure withdrew. My knees steadied.
“Gone,” Twilight said.
I looked back.
The light brightened immediately. The filament returned, thin and direct, stopping in the valley where the route had once formed. It did not reach the marker. It did not cross the open distance.
Nettle closed the slate. “Enough.”
Nobody argued.
We remained behind the rock shelf while the equipment was packed. The result was small, precise, and deeply unpleasant: the valley did not simply detect my presence. My attention helped it orient. Looking at it gave the response strength. Turning away weakened the contact, but did not erase it at once.
Twilight came to stand beside me after the lens was covered. “That gives us a safety procedure.”
“Don’t look at the haunted light.”
“More formally, avoid direct visual engagement with the phenomenon. If contact occurs, turn away and report physical effects. Do not attempt to maintain observation after strain begins.”
“Your version fits on a government form.”
“That is one of my professional strengths.”
I glanced at her. “Does it help with why I’m here?”
Her gaze moved to the sealed lens case. “It narrows the possibilities. Your arrival may have left a resonance the seam recognizes. Or you may carry a pattern that belongs to another magical region. The response is selective, but we have not proved it is personal in the way a person is personal.”
“That sentence had to work very hard not to become comforting.”
“I didn’t want to make it comforting if the evidence doesn’t support that.”
“Thank you.”
She looked at me then, surprised by the sincerity.
Nettle called the team together. “We return to Brindlehook. The inactive marker stays packed and the valley remains unapproached. I’ll send the first report by communication crystal tonight. The next phase is comparative testing with a controlled magical source, not David.”
A controlled source. A pony or object that could safely imitate the foreign resonance. The idea made my stomach tighten, though it also offered a future in which my body was no longer the only measuring device available.
“Can you find one?” I asked.
“Not today. That is why we return.”
We started down the ridge. Shining walked at my left, Twilight at my right. I watched my hooves, the loose shale, and the shadow of the equipment pack sliding across the ground.
At the bend, I looked back despite myself.
The silver light stood in the valley. It had stopped bending toward me. From that distance, it looked almost ordinary: a narrow brightness between old rocks, waiting for the next mistake.
I turned away before it could grow stronger.
Behind me, Nettle gave the order to keep moving, and the whole expedition began the descent.