Talk:Albus Dumbledore's hydro-kinetic spell

I literally just read the passage in the book, and it states the water was risen from the fountain to trap Voldemort, and was only described as ‘like a cocoon of molten glass’, not that it was transfigured into glass. And it is then stated that the water fell when Voldemort managed to escape it. So how is this spell non-canon?