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Is there a trope for when The Hero's best friend, who is The Lancer, is especially at odds with the friend that will eventually turn traitor, but The Hero himself doesn't notice or care until it happens? Like in Harry Potter, where Sirius was absolutely loyal to James but always somewhat edgy towards Peter even before Peter joined the Death Eaters?
That's a bit more suited for Trope Finder.
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How well does it match the trope?