Deathly Hallows: Part 2 Use

Does it need mentioning that Severus Snape may have used this spell during his duel with McGonagall in Deathly Hallows: Part 2? As the "fire spells" never happened in the book, as far as I can remember, it shouldn't really be considered canon, and therefore should not be listed under the Known Uses, right? Just wondering, I wasn't sure if I should remove that or keep it up, thanks. AlastorMoody 17:34, August 8, 2011 (UTC)

Okay, in Harry Potter and the Goblet of Fire, Hermione refers to it as the impediment curse not jinx or hex. I tried to add it in the behind the scenes section, but it got deleted. Look it up, its in there.