absurdly to himself, "According to the book, this is an unfavorable chance consequence of something or other." But it was more than an unfavorable chance occurrence. It was an intentional and drastic and possibly a deadly one. "Somebody's acting up," said Calhoun measuredly, in the blackness. "What's the matter with them?" He flipped the screen switch to bring back vision of what was outside. The vision screens of a ship are very carefully fused against over-load burnouts, because there is nothing in all the cosmos quite as helpless and foredoomed as a ship which is blind in the emptiness of space. But the screens did not light again. They couldn't. The cutouts hadn't worked in time. Calhoun's scalp crawled. But as his eyes adjusted, he saw the palely fluorescent handles of switches and doors. They hadn't been made fluorescent in expectation of an emergency like this, of course, but they would help a great deal. He knew what had happened. It couldn't be but one thing—a landing-grid field clamped on the fifty-ton Med Ship with the power needed to grasp and land a twenty-thousand-ton liner. At that strength it would paralyze every instrument and blow every cut-off. It could not be accident. The reception of the news of his identity, the repeated request that he identify himself, and then the demand that he wait—This murderous performance was deliberate. "Maybe," said Calhoun in the inky-black cabin, "as a Med Ship our arrival is an unfavorable chance consequence of something—or the unfavorableness is—and somebody means to keep us from happening. It looks like it." Murgatroyd whimpered. "And I think," added Calhoun coldly, "that somebody may need a swift kick in the negative feedback!" He released himself from the safety belt and dived across the cabin in which there was now no weight at all. In the blackness he opened a cabinet door. What he did inside was customarily done by a man wearing thick insulating gloves, in the landing grid back at Headquarters. He threw certain switches which would allow the discharge of the power-storage cells which worked the Med Ship's overdrive. Monstrous quantities of energy were required to put even a fifty-ton ship into overdrive, and monstrous amounts were returned when it came out. The power amounted to ounces of pure, raw energy, and as a safety-precaution such amounts were normally put into the Duhanne cells only just before a Med Ship's launching, and drained out again on its return.