The only real time you'll need to break out the explosive Confringo spell is to help Harry get over two-foot high barriers.
Check out all eight of Harry Potter's spells in action during one of the game's many challenge stages.
Sorry, there are no videos of me flapping my arms about while playing this Kinect stage. Tossing the explosive potion is just not working for me.
I'd have to play through a substantial portion of the game to capture some stealth footage, so here are the developers to explain how it works.