The Harry Potter wiki is a poor effort in multiple ways.
For instance, in this one page, the word 'may' appears 8 times, the word 'presumably' appears 3 times and the word 'apparently' also appears 3 times. There is one reference on the entire page that I can see. This is the flavour I've gotten from my personal interactions with it. There's a lack of proper sourcing and a general aroma of inference and extrapolation.
It's also just wrong in bad ways. In its plot summary of Harry Potter and the Deathly Hallows, more than once it describes events as happening in one chapter, when in fact they happened in the next. The link will lead you to the summary of Chapter 31: The Battle of Hogwarts. As I write this answer, although maybe some kind soul will go and fix it, the summary is:
At midnight, the Battle of Hogwarts begins. All the while Harry tries to locate the diadem and Ron and Hermione who had gone missing. Thinking that the diadem had not been seen in living memory, he speaks with the Grey Lady and surmises that Tom Riddle had learned of the diadem's location from her. Shortly after the battle begins, Harry recalls seeing the diadem in the Room of Requirement and meets up with Ron and Hermione, who had disappeared in order to retrieve Basilisk fangs from the Chamber of Secrets to destroy the next two Horcruxes. The trio re-enter the Room of Requirement, and Ron remembers all about the house-elves in the kitchens. He does not feel that it is right to order them to die for them, so he makes his thoughts known. With a clatter, Hermione drops all the basilisk fangs she is holding, and she and Ron share a deep, meaningful kiss, completely forgetting that Harry is there and that there is a war going on. After being reminded, they search the Room of Hidden Things, a version of the Room of Requirement that students have used to hide contraband over the centuries. Once they are inside, they are confronted by Malfoy and his cronies Vincent Crabbe and Gregory Goyle. During a short duel in which Crabbe aims to kill, Crabbe mishandles the Fiendfyre spell, causing a huge inferno. Harry, Ron, Hermione, Malfoy, and Goyle escape on two old brooms, and the diadem is destroyed by the fire, along with Crabbe. Soon after, Fred and Percy Weasley, who had just reconciled with his family, are seen duelling with two Death Eaters one of whom is Minister for Magic Pius Thicknesse. After they defeat them, there is an explosion in the corridor, and Fred is killed, deeply affecting his parents, sister and brothers, as well as Harry and Hermione.
With the cup and diadem destroyed, only one Horcrux remains. Voldemort's snake, Nagini. The trio fight their way through the castle, as the two armies battle furiously, dodging curses, Death Eaters, and Acromantulas and saving Draco Malfoy's life again along the way. When they reach the Entrance Hall, they find that Giants have joined the battle. Before leaving Hermione spots Fenrir Greyback trying to attack Lavender Brown on a balcony and casts a spell that knocks them off. While Lavender stirs feebly, Fenrir tries to get up but Sybill Trelawney drops a Crystal ball on his head and he is knocked unconscious. It is presumed that Lavender dies later. Trelawney then grabs another Crystal ball and uses her wand to throw one with a "tennis like serve". Once onto the grounds, they come across Voldemort's Dementors. Unable to produce Patronuses, because of the horrors they have witnessed, all seems lost, and Harry even welcomes the oblivion that accompanies the Dementor's Kiss. They are saved by Seamus, Luna, and Ernie, who conjure Patronuses long enough for Harry to summon the will to drive the Dementors away. Then Seamus, Luna, and Ernie run to safety.
In reality, chapter 31 ends at the end of the first paragraph. All of the events described in the second paragraph take place in the next chapter. I mean how hard can it be to check?