How does John Proctor behave towards Danforth during his questioning in Act 3?

If we have a look at this intense scene, we can see that
throughout (until the very end), John Proctor is very respectful of Judge Danforth and
recognises his position of authority and importance as a person. He calls Danforth
"Sir," for example, and gives straight, matter-of-fact responses to the questions that
Danforth asks him. Even when the focus of this scene moves to Proctor himself and his
claim that Abigail Williams is a harlot, he still maintains this attitude of respect and
deference. Consider that he responds that Elizabeth cannot lie to Danforth's question
asking whether she is an honest woman:

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In her life, sir, she have never lied. There are
them that cannot sing, and them that cannot weep--my wife cannot lie. I have paid much
to learn it, sir.

Note the
repeated use of "sir" throughout this speech and throughout this section of Act III to
refer to Danforth. It is only at the very end of this scene, when John Proctor sees the
true nature of the "justice" in Salem, that this attitude is lost. Apart from this one
section of the scene, John Proctor presents himself as a man who is deferential towards
the authority of Judge Danforth, and very respectful towards
him.