How do Proctor, Francis and Giles plan to use Mary Warren's testimony to prove that "Heaven is not speaking to through the children?"

Mary Warren confesses to them that the girls are indeed
lying. Perhaps pretending is a more accurate word, in fact, Mary Warren uses the word
pretense with Proctor.

They get her to agree to testify,
and she does indeed admit the same thing that she admitted to the guys, she uses the
word "pretense" with Danforth. She turns on her friends and claims that they were
pretending too. Proctor futher contends that Warren will "swear she lied to you."
(meaning Danforth)

The manner in which they hope to do this
is also through testimony. Giles and Proctor get together and determine that they have a
common interest, the truth... oh and land. Thus, they convince Warren to remain faithful
to that testimony. Proctor even envokes a bible story to remind her to hold fast to
truth.

Giles connects this to others who on behalf of
Putnam have been crying witchcraft just to get people's land. Giles gets peoples
testimonies, has them signed and brings them to court as his own
evidence.

The men try to prove that this is not Heaven
speaking, but Thomas Putnam.