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I only mention George's ear because in the book, much is made over the fact that Snape used sectumsempra on George, a spell that Snape created and only Snape knows how to reverse. As for Luna/Neville, as I said, I'm not overly bothered, but I annoys me just a tad that something was added in just for a group of fans who wanted it. Ah well, I probably shouldn't complain. I had half expected them to cater to the Draco Malfoy fangirls and have him stay and fight for Hogwarts. Dodged that bullet.
As far as Rowling writing more books, I'm all for Marauders era. There are still plenty of things that haven't been answered about those characters.
All things die, Anakin Skywalker, even stars burn out.
Those without swords can still die upon them