What do the judges want Mary Warren to do to prove she and the others were lying?

When Mary Warren testifies that she never saw any spirits and her behavior was pretense, Reverend Parris petitions her to faint in order to prove that she is telling the truth.

Explanation:

Unfortunately, Mary Warren cannot perform under pressure and is not able to faint. She responds to Parris's demands by saying that she used to think she saw spirits when she did not.

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