Warning: SPOILERS for Legacies season 4, episode 12, «Not All Those Who Wander Are Lost.»
After being bonded to Hope for only a short while in Legacies, Lizzie managed to break Hope's sire bond, and though the show never directly explained how, Lizzie's history is why. A few episodes earlier in Legacies season 4, new vampire and Heretic Lizzie (Jenny Boyd) discovered the unpleasant truth that it was the blood of Tribrid, Hope (Danielle Rose Russell), that she had ingested and as a result, Hope was her sire. Worse, it forged a rare sire bond between them that forced Lizzie to do Hope's bidding.
While it's the first time for Legacies, sire bonds were often used as both storyline and plot device in The Vampire Diaries and in The Originals. That's with good reason, too. While the exact details of how sire bonds work and why they happen are a little unclear (as is much of the mythology of the Vampire Diaries universe), there's no denying that it's an incredibly strong link. It's incredibly rare for a vampire to sire another, and the sire bond seems to be forged out of love for the vampire. Hybrids, however, create sire bonds more often, but it seems to be out of a sense of loyalty between the sired and their sire. Though sire bonds have been broken, it's incredibly difficult to do, making it odd that the newly-fledged Legacies Heretic Lizzie should have been able to break her sire bond with the much more powerful Hope so quickly.
Related: Legacies: Lizzie Is Becoming The Show's Caroline (& That's Great)
But to dismiss Lizzie breaking the bond as unrealistic ignores both who Lizzie is as well as how hybrid sire bonds are broken. Unlike most things in The Vampire Diaries universe, sire bonds are not technically the result of a
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