When Rodolphus saw Lucius step closer to his brother and start to undress him he stepped up. "I'll take care of Rabastan, Lucius, he is my brother after all" Sure it was his Rodolphus' protective said speaking but he said it in such a way as to imply that he did not want Rabastan to be a burden for Lucius. Rodolphus went so far as to put his arm around Rabastan's shoulders. He tried to pull the younger boy away from Lucius' grasp.