“I was under the impression,” said Snape, “that Alecto had apprehended an intruder.” “Really?” said Professor McGonagall. “And what gave you that impression?” Snape made a slight flexing movement of his left arm, where the Dark Mark was branded into his skin. “Oh, but naturally,” said Professor McGonagall. “You Death Eaters have your own private means of communication, I forgot.”
