Kerry starts to gather her books, pens, and papers together before the instructor is done speaking. She looks at her watch in an obvious way when the instructor is looking in her direction. Kerry is using Regulators to communicate.
Kerry is making gestures, most likely to signal to the instructor that the lecture time has finished. She hasn't said a word, but the idea seems clear from her behavior, thus she is using behavior to communicate a message, which how nonverbal communication works. Through a cue like looking at her watch, Kerry is communicating to the instructor that he has exceeded his speaking time.
