Theodore's eyes widened at being addressed that way, but he composed himself quickly. He had turned to get a potion for the pain, since Rosier surely was in pain, and Barty beat him to offering water. But that was just as well, he held the vial to Rosier's lips before answering.
"To help with the pain," he explained, and managed what he hoped was a comforting smile. "Theodore Nott," he said. "You trained me. Do you remember that, sir?"