"Cover him, Ryd," ordered Mury flatly. In obedience Ryd lugged out the heavy flame pistol and pointed it; his finger was dangerously tremulous on the firing lever. He moistened his lips to voice his fears; but Mury, pocketing the other gun, threw the three-way switch on the side panel, the switch that should have controlled the inner lock.
Nothing happened.
"Oh, God. We're caught. We're trapped!" The outer gangway had slid up, the lock wheezed shut, forming an impenetrable crypt of niosteel.
Mury smiled with supernal calm. "We won't be here long," he said. Then, to quiet Ryd's fears, he went on: "The central control panel and the three local switches inside, between, and outside the locks are on the circuit in that order. Unless the locks were closed from the switch just beyond the inner lock, that lock will open when the central control panel is cut out in preparation for lifting."
Almost as he paused and drew breath, a light sprang out over the switch he had closed and the inner lock swung silently free of its gaskets. Ryd felt a trembling relief; but Mury's voice lashed out like a whip as he slipped cat-like into the passage.
"Keep him covered. Back out of the lock."
Ryd backed—the white, tense face of the prisoner holding his own nervous gaze—and, almost out of the lock, stumbled over the metal pressure rings. And the gun was out of his unsure grip, clattering somewhere near his slithering feet, as he started to fall.
He saw the guardsman hurl himself forward; then he was flung spinning, back against the engine-room door. In a flash, even as he struggled to keep on his feet, he saw the man in the airlock coming up from a crouch, shifting the pistol in his right hand to reach its firing lever; he saw Mury sidestep swiftly and throw the master control switch outside.
The inner lock whooshed shut, barely missing Ryd. At the same instant, the flame gun lighted locks and passage with one terrific flash, and a scorched, discolored spot appeared on the beveled metal of the opposite lock a foot from Mury's right shoulder.