** Timing is controlled very appropriately. The student finishes the Part 1 presentation almost exactly at 4'00" ... the teacher develops detailed follow-up questions for nearly four minutes, then widens out partially, at around 7'45", to talk about language both with reference to the book, but also more generally ... and the interview finishes at 12'51", within the expected time-frame.
** The teacher's question technique is very effective - concise, clear and leading the conversation supportively. Interesting that with this obviously very able student, the questioning begins with 'what you haven't talked about' - thus challenging the student to produce her best. Regularly, especially in the Part 3 wider discussion, questions are appropriately challenging and interesting.
** Is it a well-chosen extract? It would appear so, given that the student finds a great deal to talk about. Note that there is some quite sophisticated language to discuss, and that the episode described is a relatively important point in the plot. So, even a less able student should have much to draw on. That it is a rich passage is emphasised by the following document - the notes pepared by the teacher, with highlighting to show significant elements of the text which could be used in discussion. This is obviously good professional practice - have your own version of the extract, with annotations to support the questions and discussion...