What is Abigail's vision?no

In Act III, Abigail claims that she sees Mary Warren's
spirit take the shape of bird on the rafters of the court.  The "vision" occurs right as
the court begins to see through her claims that she and her friends have been afflicted
by witchcraft.  As soon as she sees the vision, she is able to shift attention off of
her and onto Mary Warren and Proctor.  She pleads with the bird (Mary Warren) to not
attack her.  Mary Warren finds herself unable to argue against the claim as Abigail, and
then the rest of the girls, repeat every thing she says.  The call and response
continues until finally Mary Warren gives in.  Unable to fight the girls, she switches
to their side and points her finger at Proctor calling him "the devil's man" and telling
the courts she "loves God" and so will "go his (Proctor's) way no
longer."