I kept glancing off in the distance, but I never saw anything. I kept brushing away the flies, and occasionally my hand touched against the rabbit's fur, and that was when I noticed that beneath the fur, the skin was bright red.
Bright red-exactly like a bad sunburn. Just seeing it made me shiver.
I spoke into my headset. "Bobby?"
Crackle. "Yes, Jack."
"Can you see the rabbit?"
"Yes, Jack."
"You see the redness of the skin? Are you picking that up?"
"Uh, just a minute."
I heard a soft whirr by my temple. Bobby was controlling the camera remotely, zooming in. The whirring stopped.
I said, "Can you see this? Through my camera?"
There was no answer.
"Bobby?"
I heard murmurs, whispers. Or maybe it was static.
"Bobby, are you there?"
Silence. I heard breathing.
"Uh, Jack?" Now it was the voice of David Brooks. "You better go in."
"Mae hasn't come back yet. Where is she?"
"Mae's inside."
"Well, I have to wait, she's going to do cultures-"
"No. Come in now, Jack."
I let go of the rabbit, and got to my feet. I looked around, scanned the horizon. "I don't see anything."
"They're on the other side of the building, Jack."
His voice was calm, but I felt a chill. "They are?"
"Come inside now, Jack."
I bent over, picked up Mae's samples, her dissection kit lying beside the rabbit carcass. The black leather of the kit was hot from the sun.
"Jack?"
"Just a minute…"
"Jack. Stop fucking around."
I started toward the steel door. My feet crunching on the desert floor. I didn't see anything at all.
But I heard something.
It was a peculiar low, thrumming sound. At first I thought I was hearing machinery, but the sound rose and fell, pulsing like a heartbeat. Other beats were superimposed, along with some kind of hissing, creating a strange, unworldly quality-like nothing I'd ever heard. When I look back on it now, I think that more than anything else, it was the sound that made me afraid.
I walked faster. I said, "Where are they?"
"Coming."
"Where?"
"Jack? You better run."
"What?"
"Run."
I still couldn't see anything, but the sound was building in intensity. I broke into a jog. The frequency of the sound was so low, I felt it as a vibration in my body. But I could hear it, too. The thumping, irregular pulse.
"Run, Jack."
I thought, Fuck it.
And I ran. …
Swirling and glinting silver, the first swarm came around the corner of the building. The hissing vibration was coming from the cloud. Sliding along the side of the building, it moved toward me. It would reach the door long before I could.
I looked back to see a second swarm as it came around the far end of the building. It, too, moved toward me.
The headset crackled. I heard David Brooks: "Jack, you can't make it."
"I see that," I said. The first swarm had already reached the door, and was standing in front of it, blocking my way. I stopped, uncertain what to do. I saw a stick on the ground in front of me, a big one, four feet long. I picked it up, swung it in my hand. The swarm pulsed, but did not move from the door.
The second swarm was still coming toward me.
It was time for a diversion. I was familiar with the PREDPREY code. I knew the swarms were programmed to pursue moving targets if they seemed to be fleeing from them. What would make a good target?
I cocked my arm, and threw the black dissection kit high into the air, in the general direction of the second swarm. The kit landed on edge, and tumbled across the ground for a moment. Immediately, the second swarm began to go after it.
At the same moment, the first swarm moved away from the door, also pursuing the kit. It was just like a dog chasing a ball. I felt a moment of elation as I watched it go. It was, after all, just a programmed swarm. I thought: This is child's play. I hurried toward the door. That was a mistake. Because apparently my hasty movement triggered the swarm, which immediately stopped, and swirled backward to the door again, blocking my path. There it remained, pulsing streaks of silver, like a blade glinting in the sun. Blocking my path.
It took me a moment to realize the significance of that. My movement hadn't triggered the swarm to pursue me. The swarm hadn't chased me at all. Instead it had moved to block my way. It was anticipating my movement.
That wasn't in the code. The swarm was inventing new behavior, appropriate to the situation. Instead of pursuing me, it had fallen back and trapped me.
It had gone beyond its programming-way beyond. I couldn't see how that had happened. I thought it must be some kind of random reinforcement. Because the individual particles had very little memory. The intelligence of the swarm was necessarily limited. It shouldn't be that difficult to outsmart it.
I tried to feint to the left, then the right. The cloud went with me, but only for a moment. Then it dropped back to the door again. As if it knew that my goal was the door, and by staying there it would succeed.
That was far too clever. There had to be additional programming they hadn't told me about. I said into the headset, "What the hell have you guys done with these things?" David: "It's not going to let you get past, Jack."
Just hearing him say that irritated me. "You think so? We'll see." Because my next step was obvious. Close to the ground like this, the swarm was structurally vulnerable. It was a cluster of particles no larger than specks of dust. If I disrupted the cluster-if I broke up its structure-then the particles would have to reorganize themselves, just as a scattered flock of birds would re-form in the air. That would take at least a few seconds. And in that time I would be able to get through the door.
But how to disrupt it? I swung the stick in my hand, hearing it whoosh through the air, but it was clearly unsatisfactory. I needed something with a much bigger flat surface, like a paddle or a palm frond-something to create a large disrupting wind… My mind was racing. I needed something.
Something.
Behind me, the second cloud was closing in. It moved toward me in an erratic zigzag pattern, to cut off any attempt I might make to run past it. I watched with a kind of horrified fascination. I knew that this, too, had never been coded in the program. This was self-organized, emergent behavior-and its purpose was only too clear. It was stalking me. The pulsing sound grew louder as the swarm came closer and closer.
I had to disrupt it.
Turning in a circle, I looked at the ground all around me. I saw nothing I could use. The nearest juniper tree was too far away. The cholla cactuses were flimsy. I thought, of course there's nothing out here, it's the fucking desert. I scanned the exterior of the building, hoping someone had left out an implement, like a rake…
Nothing.
Nothing at all. I was out here with nothing but the shirt on my back, and there was nobody that could help me toOf course!
The headset crackled: "Jack, listen…"
But I didn't hear any more after that. As I pulled my shirt over my head, the headset came away, falling to the ground. And then, holding the shirt in my hand, I swung it in broad whooshing arcs through the air. And screaming like a banshee, I charged the swarm by the door.
The swarm vibrated with a deep thrumming sound. It flattened slightly as I ran toward it, and then I was in the midst of the particles, and plunged into an odd semidarkness, like being in a dust storm. I couldn't see anything-I couldn't see the door-I groped blindly for the doorknob-and my eyes stung from the particles, but I kept swinging my shirt in broad whooshing arcs, and in a moment the darkness began to fade. I was dispersing the cloud, sending particles spinning off in all directions. My vision was clearing, and my breathing was still okay, though my throat felt dry and painful. I began to feel thousands of tiny pinpricks all over my body, but they hardly hurt.