The sound of Rodolphus' pain would have pleased him had he been a man who took pleasure in others misery and pain. He was not however, and even as he hated Rodolphus with all his heart, his screams did nothing to please him. If anything they only told him that now was the time to strike hard, if he were to have any success.
Aiming he cast a binding hex, stronger than most, created for the Aurors to use against those most dangerous. Only it took concentration, was clumsier than lighter spells, and so he could not move in time to dodge the pain. His spell abruptly ended before completion, he felt himself fall, writhing in pain as every muscle in his body screamed out in protest in tune with his voice.