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I think Harry should remember both Sectumsempra & Levicorpus because either could come in handy when fighting Voldemort or the Death Eaters. Maybe Snape was the best teacher Harry had after-all!
Agreed!
I definitely think that seeing this spell again is a possibly. It had a huge place in HBP, no doubt, but I had a feeling all along that JKR was setting us up for Book 7 with almost everything she taught in Book 6. For that matter, I don't think there were many wasted pages in the series at all: most of what we have read was a basis, was necessary rudimentary information, for what was to come. Dumbledore's words of wisdom and everything Harry learned from the "Half-Blood Prince" will absolutely come back later. As for this particular spell ... it's harsh, and it's pretty violent. If Harry is going to continue battling on to rid the world of Voldemort, he'd better learn some more spells like it. I think the only way he's going to avoid the Unforgivable Curses is to find spells and jinxes that are almost parallel in severity, but leave less permanent results.