The question surprised him - he hadn't considered that Potter might think he had come to finish the job, at least not for the right people. Had Dumbledore asked him to do so, he would certainly have refused. This was bad enough. "No," he said, eyes narrowing a little at Potter's wand. "That isn't up to me. For reasons I will admit I don't entirely understand, the Dark Lord must do it himself."
And here was the tripping point, he suspected. Potter might have trusted him enough to meet him, but there was such a thing as asking too much. "Do you understand? He has to be the one to do it. You must deliver yourself to him." His years-old anger at Dumbledore flared up for a moment. He never should have had to say any of this; he'd signed on to protect Lily's child, not send him to his death, and now his only consolation was going to be - he hoped - seeing Voldemort finally meet his end. Cold comfort, if moderately satisfying. "You have to let him kill you."