When Mary first tells her story to the court, Danforth turns to Abigail and asks her if any of it is true. Abigail first protests against being questioned in this way, and then she openly threatens Danforth. She suddenly looks quite scared and says, "A wind, a cold wind, has come. Her eyes fall on Mary Warren." She goes cold, so that when Hathorne touches her, he confirms it, and she is "shivering visibly." The other girls -- Mercy Lewis and Susanna Walcott -- see what Abgail is doing and follow suit, saying how they freeze, too. The ploy works: Danforth turns to Mary and asks, in a very accusatory way, if she is witching Abigail and sending her spirit out to hurt her.
Later in Act Three, after Elizabeth Proctor has left the court, Abigail pretends to see a "yellow bird" upon the beam overhead, and she speaks to it as though it were Mary. She says, "But God made my face; you cannot want to tear my face. Envy is a deadly sin, Mary [....]. Oh, Mary, this is a black art to change your shape." Again, the other girls chime in to back Abigail up, and they all begin to repeat whatever Mary says, making it seem as though she is controlling them. Danforth asks Mary, "A little while ago you were afflicted. Now it seems you afflict others; where did you find this power? [....] You have seen the Devil, have you not?" Abigail has successfully cast doubt onto Mary's story and Mary herself.