Wow, ok so if this follows the book then unless someone else found the HBP's potions book, the only people that we know of that knew of the spell Sectumsempra were possible friends of Severus Snape, the Golden Trio and Draco Malfoy who it had been cast upon. My guess is that Draco is leading this new group.
I really want to know what it was that they collected in Mexico. Please post more soon.
~Tori
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