Draco wasn't surprised. After Stephen had found a way to attack the place, they could never be safe at Upper Slaughter. They couldn't use the same plan of attach twice, but they were still vulnerable, especially considering the number of people that had switched sides.
He rolled his eyes. "Sometimes for a brilliant man, he truly is stupid." Or it was the fact that he underestimated the opponent too many times. He had done it with Severus, and Stephen, and even with Draco himself. Arrogance tended to do that. "It didn't need anything that complicated. We assumed he was planning to move, but that doesn't help us if he puts the Fidelius on."