I guess I must have missed this

[elc]

Or maybe Petunia - did she make the tree branch fall in Snapes memory - or was that Snape? If it was her she could be the one to use magic that never had before...

[Raach.16]

I think that there is a possibility that JK was refering to crabbe using magic in the room of requirement. Yes, we know that he has obviously used magic before, because other wise he would have never passed the end of year tests and moved up a school year each year, or, in fact, even have been allowed to go to Hogwarts...BUT, i might be wrong, and tell me if i am, he has never used magic during the books - i mean to say we have never heard of him using any specific magic. He is always Malfoys bodyguards and tends to fight with his fists or stand there looking big and tough...right???

but im sure he cast a pell, like teeth growing (hermione) or some other spells in the coridors
i think there was one to do with neville

[mizzPotter]

luna - never used magic in the lessons only in the DA and then when she was in the ravenclaw common room she stunned the carrows and she said it was louder than i expected it to be