Then, by the light of the Mark, he saw Dumbledore's wand flying in an arc over the edge of the ramparts and understood... Dumbledore had wordlessly immobilised Harry, and the second he had taken to perform the spell had cost him the chance of defending himself.
Standing against the ramparts, very white in the face, Dumbledore still showed no sign of panic or distress. He merely looked across at his disarmer and said, 'Good evening, Draco.'
