Final answer:
Danforth suspects that Mary Warren's appearance in court might be part of a plot against him.
Step-by-step explanation:
Danforth thinks that Mary Warren's appearance in court might be a low plot to shoot him in the back.
In 'The Crucible' by Arthur Miller, Danforth is a judge in the Salem witch trials and he believes that Mary Warren, who is a witness in the trial, may be conspiring against him.
In Act III, Danforth questions Mary Warren's credibility and motives, suspecting that she may be working with the accused witches to undermine the court.
He is suspicious of her sudden change of heart and doubts the validity of her accusations against the accused individuals.
Throughout the play, the characters manipulate the court proceedings for their own gain, and Danforth is wary of being tricked or deceived by those involved in the witch trials.