 She was working off a teleprompter for her between-song patter, but improvising frequently, and for the better ... Beyoncé persevere[s], with a voice that skips up octaves and still gains power, with words that are as compelling as they are straightforward, with legs that treat the stage floor like an enemy in need of a thorough stomping.Even in moments of uncertainty, these are her constants.They survive her missteps.