Voldemort, Deatheaters, and in a few of the books Dementors
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Buckbeak was provoked by Draco and later attacked him.
Voldemort did not enter the Potter's home specifically to kill Lily and James. He was there to kill Harry due to the piece of the prophecy Snape had conveyed to him. However, Voldemort really did not care who he left dead in his wake. James tried to give Lily and Harry a chance of escape, so he was killed without a second thought. Lily stood between Voldemort and the infant Harry. Since Snape requested mercy on Lily's behalf, Voldemort gave her the choice of moving out of his way. When she refused him, he killed her anyway.
It was because of the prophecy that Professor Trelawny had made that said that both could not liveSpecifically, all Voldemort finds out of the prophecy is that the one named in the prophecy would have the power to defeat him. He does not find out about the second half, that effectively seals his fate, that neither can live while the other survives or that he will mark that one his equal.
If you mean Draco Malfoy from the Harry Potter series, then it's because Harry and Draco had got into a duel in which Harry hit Draco with the Sectumsempra curse, which gives the victim deep, potentially fatal cuts, as if they've been slashed by a sword. Harry did not know exactly what the curse did when he cast it - he'd just seen it labelled as being 'for enemies', and he was shocked by the injuries he accidentally inflicted on Draco.
The characters in Harry Potter aren't referred to a sorcerer's, they are called witches and wizards.The title of the first book in the US is called Harry Potter and the Sorcerer's Stone. The stone belonged to Nicolas Flamel.