Who else is stupid enough to jump into a frozen lake after you? Ron's jaw was clenching too hard from the shock of cold, washing over him now in a powerful shudder, to voice anything more than a very annoyed grunt. The sight of the locket made him feel a little sick to his stomach. As he saw Harry trying to pry it off, he willed his arms to move, to help him, but he was too slow. By the time he had regained enough feeling to reach for it, it was lying open against Harry's chest. Ron snatched his hand back away from it. He had never seen the thing open before, and he wasn't all sure what it was capable of doing to him.
"What are you d-doing?" he stammered, edging away from Harry in the mud. "What's it doing?"