Wow, I was expecting more of a pure Talking His Way Out of the Box solution, instead of a partial transfiguration solution. I’m curious as to whether or not this is the bad ending. I do think Voldemort was a bit stupid to not just kill Harry instantly instead of quizzing him for the Powers He Knows Not. As he said himself, given an eternity of immortality it is likely he would stumble across everything Harry has read, thought, and figured out.
Next chapter should be up any minute now...
Edit: It’s up.
I thought it was Flitwick’s invention?