When Achyut Ethiraj's final appearance in the Scripps National Spelling Bee ended far earlier than he anticipated, the 14-year-old grimaced at the microphone, walked off the stage quietly and exited the ballroom with his mother's arm draped around his back. The structure of the spelling bee has undergone plenty of changes over time, but over the past three years under executive director Corrie Loeffler, the competition has gotten very hard, very fast for spellers who make it past the preliminary rounds.