First, the professor corrects the student's position, the right arm movement and the position of the elbow in relation to the contact point of the bow. He also refers to the position of the fingertips: it is very important that they feel the contact with the bow and use it correctly (which leads to them feeling more contact with the sound).
Then there are some explanations and corrections on shifts, phrasing, relaxation, and sound maintenance without stopping the bow, bow changes and expression.