Percy kept his eyes closed until those two witches were out of the way. He didn't have the energy to deal with Bones or more mediwitches. He didn't even open them when Cass spoke up, because the world tended to spin the moment he opened them up. "Wrench has no problem disturbing me herself."
"This was supposed to be a secret. How many people know I'm here?" It would determine how long he had before he had to leave this place. There was no way that he would stay if his presence were known, and he wasn't naive enough to expect his office not to be filled with spies.