Hermione opened her mouth to argue with him when a heavy knocking sound began on the front door. She looked over at Snape, who had a confused look in his eyes, also. She made to stand, but he waved her off, getting out of his chair and swiftly making his way out of the room. Hermione got up as soon as he was out of sight and poked her head around the doorway to look down the hall at the front door.