My daughters exited the room where they were supposed to acquire the Reducto spell and continued the game without it. They can progress further into the game before getting it, but when they return to the class where they were supposed to learn the spell, it won't offer them the chance. We restarted the level without saving, and the game still won't let them get the spell. Is there a way they can back track and unlock the Reducto spell?
Yep it's a glitch. I encountered it too... Destroyed all the "metal" statues and nothing happened like REDUCTO SPELL LEARNED! instead was nothing. And I was wandering a bit around the class and then tried to walk away and guess what... I made it but without the spell. Now I'm stuck in the next level. Where reducto is crucial... Somewhere I read that to "fix" this is to start a new game and when you have lesson with Flitwick ONLY do things to acquire spell! Don't collect anything like character studs or gold blocks. Or this will happen again...