"We didn’t have much of a plan, to be honest," Draco said grudgingly, "I brewed some trace-breaking potion so that we could avoid detection, and I purchased some unregistered wands as a backup, to avoid having anything linked back to our own. I still have the potion, but the wands are in the Room of Requirement, and Umbridge has got that corridor on lock down," he added grimly, "members of the Inquisitorial Squad or Filch are there all the time, including overnight,"