DANIEL HAD NEVER HEARD I SAAC admit to feeling pain, until he and Leibniz each took one of his hands and pulled him to his feet. Then Isaac got an astonished look, as though he’d never hurt before in his life, and let out an "Ooh-oh! Ah! Ah!" He clenched his eyes shut, grimaced, and steepled his brow, then froze just long enough to convince Daniel that he was suffering a cardiac event that would terminate his life. But finally the pain appeared to leak away in slow increments, and his conscious mind assumed control over the nerves that led to the muscles of the face. He could now wear the expression he wished to: one of forced unconcern. "It is," he said, and stopped to sip air, "nothing. The muscles...about the ribs...were not ready...for Baron von Leibniz’s... intervention ."