Blaine returned to the root of his origin story to rescue the trophy, but the whole thing was a trap orchestrated by the new captain of the Warblers to lure Blaine away from the New Directions. New-guy Hunter did his research and played on Blaine’s insecurities—why stay at McKinley without Kurt? Don’t you remember how great it felt to belong somewhere? C’mon, buddy, let’s just sing a song, just one song. What’s the harm in one song?
Blaine put up a good fight, but in the end, that blazer fit like an old, familiar glove, and Blaine figured that if he was already a villain, citing how deeply he’d hurt Kurt, then why not just embrace it and go total dark side—where I’m told they have cookies, after all. He returned to McKinley intending to finish his senior year at Dalton, arguing to a completely floored Sam [sic], “Warblers are my birthright and my destiny.”
Spoken like a true superhero headcase, Blaine.
Tv.com recap of 4.07, “Dynamic Duets” [source]