Isabella Marie Swan 〢"Phoenix"

"Thank you," says Mr. Phelps. "Unfortunately, allowing the front half of the class to try their respective hands at noticing something amiss would require more editing than I ever perform on students at this point, but do notice that everyone behind Miss Stark here, who was charmed, merely assumed they'd 'spaced out', re-read the paragraph that had gone missing, and otherwise went on undisturbed. In other words, 'spacing out' - making a general habit of it - is a hazard to your ability to react to your surroundings. Attention, and the readiness to react, are the core of Defense."