"Apparently," said Fred, "It's - Quirrell, I think - just look." He pointed at the Map with his lit wand, and George paced over and looked, too. Fred had been thus far not worried about Quirrell, who was pacing around his office down the hall but showed no signs of leaving. But a moment ago, Quirrell's name had started flickering, and going all blurry, and then it showed "Tom Riddle" instead, and then blurred out and went back to "Quirinus Quirrell," and then changed again, flickering quicker and quicker.