His neck   burned,  and he had to hold his breath to stop his groan of pain from escaping him. Out of the corner of his eye, he saw a trail of steam rising from his skin and floating away in the air above him. As the sensation of burning ebbed away, Harry was aware of a new strange sensation - it felt like his skin was being slowly stretched and pinched together like the casing of a dumpling being closed to seal in the filling inside. He looked to Snape’s face, and was surprised by the intense focus he was directing towards Harry’s wound, watching the injury steam and throb... and... and was it   healing?!