His dominant impulse was to do as he had once done before: he laid his firm, gentle hand on the hand that grasped him. Mordecai's, as if it had a soul of its own--for he was not distinctly willing to do what he did--relaxed its grasp, and turned upward under Deronda's. 
Instead, he laid his firm, gentle hand on Mordecai's, which relaxed its grasp, and turned upward. 