(It's good that he cleared up that "bigly/big league" question too! Now what are they going to discuss? Maybe they'll start to question whether he is saying "Make America Great Again!" or "Make America Grate Again!") :-)
I think he is nervous (about the polls) tired (for obvious reasons) and defensive. He has suffered tremendous attack and unfair judgment.
Also, i still believe he is nascent in faith...not in tune with the lingo yet...but he has great respect for people of faith. And his authenticity is refreshing.