This is sort of two questions in one. First of all, how do you interact with/blow up/get rid of objects that have red sparkles? I have done all the levels but am trying to get 100% completion and these objects keep appearing and I don't know what to do with them. Nothing I've tried seems to work and I have bought all the spells from Diagon Alley and I'm not convinced you need to be a specific character. Following this, in the first charms classroom you go into (not the one you learn lumos in) there is a trap door which I have gone down and now can't get back out of. There is a big boulder with red sparkles down there but like I say, I don't know what to do with it. If I exit the game or just go back to the Leaky Cauldron and then return to Hogwarts I'm stuck in the same place. Help!