Chiastic Bookends

I have a number of posts I have been planning to write when I get the time, especially since finishing book 5 - but I thought here I would simply toss in a small observation from book 6 (which I have been not so much re-reading as slowly perusing chapter by chapter while waiting on other things involved with work or some family situations). This is just a short little observation about "bookends" as contributing to the chiastic structure (cf sidebar permalink on chiasm). "Bookends" are distinctly similar occurences or elements at the beginning and end of a book or series (in Greek and Latin there is the same sort of thing but with grammatical elements that set off what is called an "inclusio," in which all of what is inside is meant to be taken as a syntactical or semantic unit, in both languages it can also use, say, the two parts of a compound verb, with the main verb at the beginning of the unit and the helping verb, a form of the being verb, at the end and everything in middle taken together). Rowling's "bookends" also fittingly bear the "development/deepening" that is characteristic of chiastic pairings. This is the one I noticed in book 6: At the beginning, as Harry and Dumbledore have just apparated in the neighborhood of the house Slughorn is "squatting" in (I loved her image here, Sluggo's physical stance of squatting calling to mind the occupational habits of those who claim "squatters' rights"), Dumbledor tells Harry to have his wand at the ready but does not think he is likely to be attacked, and in answer to the questio of "why?" DD says that it is because Harry is with him. At the other end of the book, however, the development of this element is that the shoe is on the other foot - as they swim from the cave Harry tells Dumbledore not to worry and he replies (something like): "I am not worried Harry, I am with you." Of course, I think any parent who has a grown child who has grown up to be responsible and loving recognizes this progression.