Oliver/Percy/Angelina. Don't call my bl I asked her who did it. She said: "[T]his sort of thing is typically assigned by one of the Inner Circle or the dark lord himself directly to the person for the exact reason in that there's a chance someone would say something, and I would have if I knew this was going to happen. The idea is you get an order and you do it, and no one else knows unless its something really big that requires a bunch of people. A test of their commitment in this case.