Sam thought the professor was pretty casual about putting someone’s life on the line to test a theory, and he didn’t like it one bit. But then he only had their word about the spell. All he got was a headache and he had those all the time. "Even if I did stop Estios’s spell," Sam said wearily, "that doesn’t make me a magician. I’ve read about people who can protect themselves from magic without being magicians. They’re catted negamages."