Once he had gone through the bulk of the material to be covered, Spock started the free-for-all word association and watched and listened, occasionally providing more depth and clarification. Usually he would end the practice session five minutes before the end of class, for an open Q&A session but today he was too tense to ignore unwanted emotional displays. He ignored Uhura’s unhappy expression as she waited until the last possible minute before leaving. She had a class across campus right after this one.