"Acid!" He choked out the words between strangled breaths. "Acid--sulfuric--fumes!"
Chet turned quickly to the spectro-analyzer; the lines of oxygen and nitrogen were merged with others, and that meant an atmosphere unfit for human lungs! There had been a fumerole where yellowish vapor was spouting; he remembered it now.
"So!" boomed Schwartzmann, and now his squinting eyes were full on Chet. "You--you _schwein!_ You said when we opened the ports there would be a surprise! Und this iss it! You thought to see us kill ourselves!"
"Open the port!" he shouted. The men who held Chet released him and sprang forward to obey. The pilot, Max, took their place. He put one hand on Chet's shoulder, while his other hand brought up a threatening, metal bar.
Schwartzmann's heavy face had lost its stolid look; it was alive with rage. He thrust his head forward to glare at the men, while he stood firmly, his feet far apart, two heavy fists on his hips. He whirled abruptly and caught Diane by one arm. He pulled her roughly to him and encircled the girl's trim figure with one huge arm.
"Put you _all_ on one island?" he shouted. "Did you think I would put you _all_ out of the ship? You"--he pointed at Harkness--"and you"--this time it was Chet--"go out now. You can die in your damned gas that you expected would kill me! But, you fools, you imbeciles--Mam'selle, she stays with me!" The struggling girl was helpless in the great arm that drew her close.
Harkness' mad rage gave place to a dead stillness. From bloodless lips in a chalk-white face he spat out one sentence:
"Take your filthy hands off her--now--or I'll--"
Schwartzmann's one free hand still held the pistol. He raised it with deadly deliberation; it came level with Harkness' unflinching eyes.
"Yes?" said Schwartzmann. "You will do--what?"
Chet saw the deadly tableau. He knew with a conviction that gripped his heart that here was the end. Walt would die and he would be next. Diane would be left defenseless.... The flashing thought that followed came to him as sharply as the crack of any pistol. It seemed to burst inside his brain, to lift him with some dynamic power of its own and project him into action.
He threw himself sideways from under the pilot's hand, out from beneath the heavy metal bar--and he whirled, as he leaped, to face the man. One lean, brown hand clenched to a fist that started a long swing from somewhere near his knees; it shot upward to crash beneath the pilot's out-thrust jaw and lift him from the floor. Max had aimed the bar in a downward sweep where Chet's head had been the moment before; and now man and bar went down together. In the same instant Chet threw himself upon the weapon and leaped backward to his feet.