There is a specific musical intention at the beginning with the first crescendo. Other considerations about tempo: it must be maintained (not rallentando). Corrections on glissando.
Regarding bowings, the professor works on the right point to place and slide the bow and on the clarity in a specific passage. There are also explanations about Britten's character, quality of sound, color, fingerings, vibrato, and harmonics; as well as about his interpretation and the length of the last notes in the phrases.