He broke off, all his attention concentrated on the palm of one hand which was still pressed against the ground, then said urgently, “Run for the ship.”
They were much less careful about stepping on plants on the way back, and as the hatch slammed shut behind them Harrison’s voice rattled at them from the lock communicator.
“Are we expecting company?”
“Yes, but not for a few minutes,” said Conway breathlessly. “How much time do you need to get away, and can we observe the tools’ arrival through something bigger than this airlock port?”
“For an emergency liftoff, two minutes,” said the pilot, “and if you come up to Control you can use the scanners, which check for external damage.
“But what were you doing, Doctor?” Harrison resumed as they entered his control position. “I mean, in my experience the front of the bicep is not considered to be a zone of erotic stimulation.”
When Conway did not answer he looked appealingly at Murchison.
“He was conducting an experiment,” she said quietly, “designed to prove that I cannot see with the nerve endings of my upper arm. When we were interrupted he was proving that I did not have eyes in the back of my neck, either.”
“Ask a silly question. . .” began Harrison.
“Here they come,” said Conway.
They were three semicircular disks of metal which seemed to flicker into and out of existence on the area of ground covered by the long morning shadow of the scout ship. Harrison stepped up the magnification of his scanners, which showed that the objects did not so much appear and disappear as shrink rhythmically into tiny metal blobs a few inches across, then expand again into flat, circular blades which knifed through the surface. There they lay flat for a few seconds among the shadowed eye plants, then suddenly the discs became shallow inverted bowls. The change was so abrupt that they bounced several yards into the air to land about twenty feet away. The process was repeated every few seconds, with one disc bouncing rapidly toward the distant tip of their shadow, the second zig-zagging to chart its width and the third heading directly for the ship.
“I’ve never seen them act like that before,” said the lieutenant.
“We’ve made a long, thin itch,” said Conway, “and they’ve come to scratch it. Can we stay put for a few minutes?”
Harrison nodded, but said, “Just remember that we’ll still be staying put for two minutes after you change your mind.”
The third disk was still coming at them in five-yard leaps along the center of their shadow. He had never before seen them display such mobility and coordination, even though he knew that they were capable of taking any shape their operators’ thought at them, and that the complexity of the shape and the speed of the change were controlled solely by the speed and clarity of thought of the user’s mind.
“Lieutenant Harrison has a point, Doctor,” said Murchison suddenly. “The early reports say that the tools were used to undercut grounded ships so that they would fall inside the strata creature, presumably for closer examination at its leisure. On those occasions they tried to undercut the object’s shadow, using the shaded eye plants as a guide to size and position. But now, to use your own analogy, they seem to have learned how to tell the itch from the object causing it.”
A loud clang reverberated along the hull, signaling the arrival of the first tool. Immediately the other two turned and headed after the first, and one after the other they bounced high into the air, higher even than the control position, to arch over and crash against the hull. The damage scanners showed them strike, cling for a few seconds while they spread over hull projections like thin, metallic pancakes, then fall away. An instant later they were clanging and clinging against a different section of hull. But a few seconds later they stopped clinging because, just before making contact, they grew needle points which scored bright, deep scratches in the plating.
“They must be blind,” said Conway excitedly. “The tools must be an extension of the creature’s sense of touch, used to augment the information supplied by the plants. They are feeling us for size and shape and consistency.”