Dramatic Irony: The characters think one thing to be true, but the audience knows something else to be true
The reader already knows that all these irregular events are set up by Abigail. Though Danforth does not know this so he sides with her.
"Repeated pattern of figures."
The correct meaning of ir- prefix is that it means not responsible.
Hope this helped if it did than mark me as brainiest.
DO you have a picture you can post about the passage?