"Merlin, how could he have been so wrong?" Rodolphus asks helplessly.
"Untraceable exotic poisons are hard to come by when you're on the run," he explains with a wink.
Rodolphus looks utterly confused. "I don't understand," he says. "How can he know a Rodolphus that isn't me? How can Lucius not be Lucius?" He shakes his head, bewildered. "What other professors?" They might be a problem. "Sirius Black is here too?" He feels the need to sit down and does so heavily on the sand. "I don't understand," he says again. He looks appealingly at Severus.