Abigail is acting as though Mary's ghost is attacking her.
Abigail and the other girls put on such a convincing act that Mary Warren starts to feel threatened, especially in front of the judge, who now appears to be deceived by the girls' pretence. Mary accuses Proctor of bewitching her after he threatens to hang her.
Mary ultimately succumbs to peer pressure. She breaks down in tears as she admits that Proctor coerced her into signing her name in the Devil's book and convinced her to testify against the girls in court.
The jury believes her, but the audience is aware that she is lying.
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