Howard Palamarchuk was engrossed in a routine he’s developed over 28 years as a medical volunteer at the Boston Marathon. Then the bombs exploded. Within minutes, Palamarchuk and nine Temple podiatry students scrambled for whatever they could find to help stabilize blast victims. “Everybody pitched in. You had to put away your fear and panic,” said Palamarchuk, who is director of sports medicine at Temple’s School of Podiatric Medicine.