Here's what actually happened:
* The situation: Harry Potter, Ron Weasley, and Hermione are in the Room of Requirement, trying to escape the Death Eaters who are searching for them. They are cornered by Bellatrix, Narcissa Malfoy, and Draco Malfoy.
* The confrontation: Bellatrix threatens the trio with a Cruciatus Curse, demanding to know how they acquired the Sword of Gryffindor.
* Harry's lie: Harry, to protect Hermione, lies and says he found the sword in the Chamber of Secrets, a lie he had already told to Ron and Hermione.
* Bellatrix's reaction: Bellatrix, believing Harry, becomes obsessed with retrieving the sword herself. This opens the door for Harry to escape with Ron and Hermione, as Bellatrix loses interest in pursuing them.
It was Harry, not Hermione, who directly interacted with Bellatrix in this tense scene.