Expert teachers have high teaching efficacy, which can be defined as

Teaching efficacy can be defined as a teacher's beliefs and faith in his or her skills and abilities to effectively teach students and aid their learning. According to psychologists, teachers who have higher teaching efficacy are more likely to be great or "expert" teachers since their belief in their effective teaching abilities in turn make them more likely to perform behaviors of actions of teaching effectively. 

The jugular vein located, on an animal, starts proximally at the base of the neck and moving towards the head along the jugular groove.

He was probably very upset and disapointed and mad. all at once. so he probably wanted to show his disapointment, angryness, and depression. he didn't think of the affects due to the minor issue thst he has gone through. sorry if it doesn't . but i am trynna people.