Rodolphus was panicking though he didn't show it. He knew it was talk but there was always a chance that his lord might kill him and then he heard what Bellatrix said. He let out a small breathe knowing what she had said was true, the bit about him, about Lucius about Severus all of it was true.
Taking a deep breathe he glanced quickly at his wife next to him and then said while dropping to his knees with a bowed head, "What Bellatrix said is true my Lord but I will willingly accept death if that is what you want." He would hate to die and leave Bellatrix but this needed to be said. It would increase his chance of surviving the meeting.