Oscar lifted his arm so we could get a better look. The winged crystal had no eyes or segments or any other division in its body. It was just a curl of something like quartz, with legs (if you could call them that) as fine as eyelashes, which it used to cling to the fabric of Oscar’s suit. Its wings beat against the pressure of the wind. It looked as harmless as a piece of costume jewelry. The cloud descending the walls of the cube was composed of countless numbers of these things—millions, maybe billions of them.

Then, out along the periphery of the lights, a soldier began to scream.

2.

The soldiers reacted quickly and professionally: they grabbed the portable lights and began waving the civilians back the way we had come. They did this despite the fact that hundreds or thousands of these tiny crystalline butterflies were swarming them, obscuring their vision and covering their clothing.

The butterflies were settling on me and Oscar, too, but not as aggressively. When I flicked my arm they fell away and dropped to the ground, inert. And when I brushed them away from Oscar they scattered from my hand.

Nevertheless we ran. Everyone was running now. The lamps the soldiers carried cast wheeling, hectic beams ahead of us. Through my earpiece I could hear barked commands and more screams, while the cloud of crystalline devices swirled around us like silent snow.

Other members of the expedition began to fall away behind us. I saw this in serial glances, looking back over my shoulder. Anyone who dropped to the ground was instantly swarmed, covered in a glassy drift, becoming a pale mound that heaved at first but quickly settled—I don’t have a better word for it. I began to understand that these men and women were dying.

The technicians died first. The soldiers wore heavier protective clothing, but even they were slowly being overwhelmed. The lamps when they dropped them raked light at static angles across the plain.