Long hours of watching examinees go by doing techniques have practically put him to sleep. However, long years of training have taught him to be extra sensitive to other's emotional states and expressions. He sees the error. He pretends to make a mark, but lets it go. He decided a month ago that she would pass barring any fatal errors.
Most instructors know the outcome of most exams before they are even two weeks away.
Some students occasionally surprise with sudden outbursts of idiocy or effort. Usually exams are fairly predictable, though. As the kumite section comes, she adequately performs the techniques and blocks all attacks. She fails, however, to really give 100 percent of her effort by emitting a strong kiai and trying some more difficult defenses during one step sparring. Not putting all one's effort into the test.