This seemed to enrage Kalinski more than anything else, and led him to renewed efforts to down his antagonist. It could end but one way. Bob Jarvis saw that as he stood clenching and unclenching his hands, muttering to himself: "It's a fair fight; you can't interfere. It's a fair fight; you can't interfere!" The Iron Boy was doing his best to keep out of it, but he wished from the bottom of his heart that Kalinski would turn on him, thus giving Bob an excuse to even up old scores. A big crowd had gathered and was urging on the combatants, jeering, shouting in a chorus of discordant yells. Suddenly Ignatz Brodsky toppled over backwards, his arms waving feebly as he fell. He struck the ground heavily and lay there moaning. With a shout of triumphant rage Kalinski sprang forward and began kicking the prostrate boy with his heavy boots. The pit boss was beside himself with rage, for Brodsky had goaded him to the point of desperation. The crowd apparently had no inclination to interfere with this brutal act, for they continued their shouting and jeering. There was one, however, who did propose to interfere. Such a scene was more than Bob Jarvis could witness without taking a hand. With a roar he hurled himself into the centre of the circle that had been formed about the combatants. A firm hand was laid on the arm of the boss, and ere he knew what was occurring he was thrown flat on his face in the dirty street. The crowd was not exactly sure whether it approved of this or not, and, deciding that it did not, began to hiss. "He's a coward!" shouted Bob. "He, a full-grown man, to thrash a boy, then kick him after he is down! I am surprised that you loafers could stand here and see it done without offering to interfere." "Look out! He's coming for you!" warned a friendly voice. But Jarvis did not need the warning. He had been watching the boss narrowly while scoring the crowd, and he was ready for the next move. As a matter of fact Bob did not believe Kalinski would fight him. In this he was wrong, for the Pole's rage blinded his better judgment. His brutal instincts were in full control. Kalinski was on his feet almost instantly, and with a yell of rage he rushed the Iron Boy. Jarvis stepped nimbly to one side, tripped the man and once more threw him on his face. The crowd jeered. This wasn't fighting. They wanted to see blood flow. Their desires were soon gratified, for no sooner had Kalinski jumped to his feet again, and made a vicious swing at Jarvis, than the boss received a stinging blow on his sore nose from Bob's right, and another on his right eye from Bob's left fist. After that it was give-and-take. Neither man gave ground in the slightest, but it was plain that, while possessed of great muscular force, the Pole lacked the science of the Iron Boy. When the former did land it jarred Bob Jarvis from head to feet, sometimes sending him staggering backward, gasping for breath.