Percy nodded, though he very much did not want to. He wished he could take his little brother with him, selfish though that desire was; he wanted company, he didn't want to go face Voldemort all alone. But there was only enough potion for one, and if there was anything he didn't want even more than he didn't want to fight Voldemort, it was that he didn't want Ron to do it. So he nodded, and said, "Yes. We discussed this. Do not argue with me. Get the twins to Madam Pomfrey, and then ... " he thought for a second " ... and then go to the Owlery. McGonagall was no help earlier and she's not going to be any help now, but Dumbledore might be, given all the proof. Get Hermes and write him out everything we know, and then ... "