Actually, I think I know where the strange "Ginny in the swamp" scene fits into the storyline now. I remember hearing something about a new scene being added to the existing story, where a group of Death Eaters actually attack the Burrow. I assume this is from that scene...perhaps Ginny gets caught outside, and from the looks of things, Fenrir Greyback (or another of his werewolves) is hunting her through the reeds. Maybe her father, Arthur, gets scarred by Fenrir at this point, instead of it being Bill who is attacked during the end battle, because we haven't seen enough of Bill during the films to have any emotional connection to him. I know, even though Half-Blood Prince was quite a bit shorter than Order of the Phoenix, that material will have to be lost in the translation from book to film. They will most likely only keep the absolutely essential plot elements, such as Harry learning about Voldemort's past through the pensieve, the revelation of the Horcruxes, Slughorn's arrival at Hogwarts and his own dark history, and of course the various romances of the story, including Ginny and Harry, Ron and Lavender, and perhaps even Hermione and McCleggan, since I heard Ron's lost storyline as Keeper for the Qudditch team from Order of the Phoenix has been transplanted to this film instead.
