It was the unexpected. Hans and Edith were stunned. They sat at the table with bodies tense, their eyes fixed in a fascinated gaze upon the murderer. Dimly they saw him through the smoke of the powder, and in the silence nothing was to be heard save the drip-drip of Dutchy's spilled coffee on the floor. Dennin threw open the breech of the shot-gun, ejecting the empty shells. Holding the gun with one hand, he reached with the other into his pocket for fresh shells. He was thrusting the shells into the gun when Edith Nelson was aroused to action. It was patent that he intended to kill Hans and her. For a space of possibly three seconds of time she had been dazed and paralysed by the horrible and inconceivable form in which the unexpected had made its appearance. Then she rose to it and grappled with it. She grappled with it concretely, making a cat-like leap for the murderer and gripping his neck-cloth with both her hands. The impact of her body sent him stumbling backward several steps. He tried to shake her loose and still retain his hold on the gun. This was awkward, for her firm-fleshed body had become a cat's. She threw herself to one side, and with her grip at his throat nearly jerked him to the floor. He straightened himself and whirled swiftly. Still faithful to her hold, her body followed the circle of his whirl so that her feet left the floor, and she swung through the air fastened to his throat by her hands. The whirl culminated in a collision with a chair, and the man and woman crashed to the floor in a wild struggling fall that extended itself across half the length of the room. Hans Nelson was half a second behind his wife in rising to the unexpected. His nerve processes and mental processes were slower than hers. His was the grosser organism, and it had taken him half a second longer to perceive, and determine, and proceed to do. She had already flown at Dennin and gripped his throat, when Hans sprang to his feet. But her coolness was not his. He was in a blind fury, a Berserker rage. At the instant he sprang from his chair his mouth opened and there issued forth a sound that was half roar, half bellow. The whirl of the two bodies had already started, and still roaring, or bellowing, he pursued this whirl down the room, overtaking it when it fell to the floor. Hans hurled himself upon the prostrate man, striking madly with his fists. They were sledge-like blows, and when Edith felt Dennin's body relax she loosed her grip and rolled clear. She lay on the floor, panting and watching. The fury of blows continued to rain down. Dennin did not seem to mind the blows. He did not even move. Then it dawned upon her that he was unconscious. She cried out to Hans to stop. She cried out again. But he paid no heed to her voice. She caught him by the arm, but her clinging to it merely impeded his effort.