I noticed that as well. However, at Azkahban QQ reserved an extra use of the time turner for the end and it proved necessary. He may just think that as a best practice for plotting one should leave an extra use of time turners in as margin of safety.
I noticed that as well. However, at Azkahban QQ reserved an extra use of the time turner for the end and it proved necessary. He may just think that as a best practice for plotting one should leave an extra use of time turners in as margin of safety.